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3  {
4   "cell_type": "markdown",
5   "metadata": {},
6   "source": [
7    "This notebook discusses how explicit automata (the `spot::twa_graph_ptr` objects in C++) are stored by Spot.  The Python bindings do not expose all of the internals available in C++, however they have some graphical representation that are convenient to present those inner workings."
8   ]
9  },
10  {
11   "cell_type": "code",
12   "execution_count": 1,
13   "metadata": {},
14   "outputs": [],
15   "source": [
16    "import buddy\n",
17    "import spot\n",
18    "spot.setup(show_default='.n')\n",
19    "from IPython.display import display"
20   ]
21  },
22  {
23   "cell_type": "markdown",
24   "metadata": {},
25   "source": [
26    "# The two-vector representation"
27   ]
28  },
29  {
30   "cell_type": "markdown",
31   "metadata": {},
32   "source": [
33    "Let's consider a small automaton, generated from an LTL formula."
34   ]
35  },
36  {
37   "cell_type": "code",
38   "execution_count": 2,
39   "metadata": {},
40   "outputs": [],
41   "source": [
42    "aut = spot.translate('GF(a <-> Xa) & FGb', 'det', 'gen')"
43   ]
44  },
45  {
46   "cell_type": "code",
47   "execution_count": 3,
48   "metadata": {},
49   "outputs": [
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154       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd3c40c2b70> >"
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156     },
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163    "aut"
164   ]
165  },
166  {
167   "cell_type": "markdown",
168   "metadata": {},
169   "source": [
170    "The graphical representation above is just a convenient representation of that automaton and hides some details.  Internally, this automaton is stored as two vectors plus some additional data.  All of those can be displayed using the `show_storage()` method.  The two vectors are the `states` and `edges` vectors.  The additional data gives the initial state, number of acceptance sets, acceptance condition, list of atomic propositions, as well as a bunch of [property flags](https://spot.lrde.epita.fr/concepts.html#property-flags) on the automaton.  All those properties default to `maybe`, but some algorithms will turn them to `yes` or `no` whenever that property can be decided at very low cost (usually a side effect of the algorithm).  In this example we asked for a deterministic automaton, so the output of the construction is necessarily `universal` (this means no existantial branching, hence deterministic for our purpose), and this property implies `unambiguous` and `semi_deterministic`."
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172  },
173  {
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362       "<text text-anchor=\"start\" x=\"539.5\" y=\"-244.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
363       "</g>\n",
364       "<!-- meta -->\n",
365       "<g id=\"node3\" class=\"node\">\n",
366       "<title>meta</title>\n",
367       "<text text-anchor=\"start\" x=\"10.5\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">init_state:</text>\n",
368       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"76.5,-118 76.5,-137 165.5,-137 165.5,-118 76.5,-118\"/>\n",
369       "<text text-anchor=\"start\" x=\"78.5\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
370       "<text text-anchor=\"start\" x=\"10.5\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">num_sets:</text>\n",
371       "<text text-anchor=\"start\" x=\"78.5\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">2</text>\n",
372       "<text text-anchor=\"start\" x=\"10.5\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">acceptance:</text>\n",
373       "<text text-anchor=\"start\" x=\"78.5\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">Fin(0) &amp; Inf(1)</text>\n",
374       "<text text-anchor=\"start\" x=\"10.5\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">ap_vars:</text>\n",
375       "<text text-anchor=\"start\" x=\"78.5\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">b a</text>\n",
376       "</g>\n",
377       "<!-- meta&#45;&gt;states -->\n",
378       "<!-- props -->\n",
379       "<g id=\"node4\" class=\"node\">\n",
380       "<title>props</title>\n",
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382       "<text text-anchor=\"start\" x=\"416.5\" y=\"-180.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
383       "<text text-anchor=\"start\" x=\"272.5\" y=\"-161.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_inherently_weak:</text>\n",
384       "<text text-anchor=\"start\" x=\"416.5\" y=\"-161.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
385       "<text text-anchor=\"start\" x=\"272.5\" y=\"-142.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_terminal:</text>\n",
386       "<text text-anchor=\"start\" x=\"416.5\" y=\"-142.8\" font-family=\"Times,serif\" font-size=\"14.00\">no</text>\n",
387       "<text text-anchor=\"start\" x=\"272.5\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_weak:</text>\n",
388       "<text text-anchor=\"start\" x=\"416.5\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
389       "<text text-anchor=\"start\" x=\"272.5\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_very_weak:</text>\n",
390       "<text text-anchor=\"start\" x=\"416.5\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
391       "<text text-anchor=\"start\" x=\"272.5\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_complete:</text>\n",
392       "<text text-anchor=\"start\" x=\"416.5\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
393       "<text text-anchor=\"start\" x=\"272.5\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_universal:</text>\n",
394       "<text text-anchor=\"start\" x=\"416.5\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
395       "<text text-anchor=\"start\" x=\"272.5\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_unambiguous:</text>\n",
396       "<text text-anchor=\"start\" x=\"416.5\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
397       "<text text-anchor=\"start\" x=\"272.5\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_semi_deterministic:</text>\n",
398       "<text text-anchor=\"start\" x=\"416.5\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
399       "<text text-anchor=\"start\" x=\"272.5\" y=\"-9.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_stutter_invariant:</text>\n",
400       "<text text-anchor=\"start\" x=\"416.5\" y=\"-9.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
401       "</g>\n",
402       "<!-- props&#45;&gt;edges -->\n",
403       "</g>\n",
404       "</svg>\n"
405      ],
406      "text/plain": [
407       "<spot.jupyter.SVG object>"
408      ]
409     },
410     "execution_count": 4,
411     "metadata": {},
412     "output_type": "execute_result"
413    }
414   ],
415   "source": [
416    "aut.show_storage()"
417   ]
418  },
419  {
420   "cell_type": "markdown",
421   "metadata": {},
422   "source": [
423    "Each state is represented by an integer that is a 0-based index into the `states` array.  Each edge is also represented by an integer that is a 1-based index into the `edges` array.  In the above picture, yellow and cyan denote state and edge indices respectively.\n",
424    "\n",
425    "Adding a new edge, for instance, will augment the size of the `edges` array and return the index of the newly added edge:"
426   ]
427  },
428  {
429   "cell_type": "code",
430   "execution_count": 5,
431   "metadata": {},
432   "outputs": [
433    {
434     "data": {
435      "text/plain": [
436       "9"
437      ]
438     },
439     "execution_count": 5,
440     "metadata": {},
441     "output_type": "execute_result"
442    }
443   ],
444   "source": [
445    "s = aut.new_state()\n",
446    "aut.set_init_state(s)\n",
447    "aut.new_edge(s, 0, buddy.bddtrue)"
448   ]
449  },
450  {
451   "cell_type": "code",
452   "execution_count": 6,
453   "metadata": {},
454   "outputs": [
455    {
456     "data": {
457      "image/svg+xml": [
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462       " -->\n",
463       "<!-- Pages: 1 -->\n",
464       "<svg width=\"279pt\" height=\"222pt\"\n",
465       " viewBox=\"0.00 0.00 278.50 221.67\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n",
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468       "<text text-anchor=\"start\" x=\"83.25\" y=\"-199.47\" font-family=\"Lato\" font-size=\"14.00\">Fin(</text>\n",
469       "<text text-anchor=\"start\" x=\"108.25\" y=\"-199.47\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
470       "<text text-anchor=\"start\" x=\"124.25\" y=\"-199.47\" font-family=\"Lato\" font-size=\"14.00\">) &amp; Inf(</text>\n",
471       "<text text-anchor=\"start\" x=\"167.25\" y=\"-199.47\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
472       "<text text-anchor=\"start\" x=\"183.25\" y=\"-199.47\" font-family=\"Lato\" font-size=\"14.00\">)</text>\n",
473       "<text text-anchor=\"start\" x=\"106.25\" y=\"-185.47\" font-family=\"Lato\" font-size=\"14.00\">[Rabin 1]</text>\n",
474       "<!-- I -->\n",
475       "<!-- 2 -->\n",
476       "<g id=\"node2\" class=\"node\">\n",
477       "<title>2</title>\n",
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479       "<text text-anchor=\"middle\" x=\"56\" y=\"-59.97\" font-family=\"Lato\" font-size=\"14.00\">2</text>\n",
480       "</g>\n",
481       "<!-- I&#45;&gt;2 -->\n",
482       "<g id=\"edge1\" class=\"edge\">\n",
483       "<title>I&#45;&gt;2</title>\n",
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486       "</g>\n",
487       "<!-- 0 -->\n",
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791      "text/plain": [
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794     },
795     "metadata": {},
796     "output_type": "display_data"
797    }
798   ],
799   "source": [
800    "display(aut, aut.show_storage(\"v\"))  # \"v\" displays only the states and edges Vectors"
801   ]
802  },
803  {
804   "cell_type": "markdown",
805   "metadata": {},
806   "source": [
807    "For each state, the `states` vector stores two edge indices: `succ` is the index of the first outgoing edge, and `succ_tail` is the index of the last outgoing edge.  Since there is no edge at index `0`, that value is used to indicate that there is no outgoing edge.\n",
808    "\n",
809    "In the `edges` vector, the field `next_succ` is used to organize the outgoing edges of a state as a linked list.  For instance to iterate over all successors of state `0`, we would start at the edge `e = states[0].succ` (if it's not `0`),\n",
810    "then move to the next successor with `e = edges[e].next_succ`, and repeat until `e` becomes `0`.  This code cannot be executed in Python because the automaton class won't let us access the `states` vector.  However this iteration mechanism is what is used into the `out()` method: `out()` simply provides an iterator over some columns of the `edges` vector, following the `next_succ` links.  When we have a reference to a column of `edges` as returned by `out()`, we can convert it into an edge index with the `edge_number()` method."
811   ]
812  },
813  {
814   "cell_type": "code",
815   "execution_count": 7,
816   "metadata": {},
817   "outputs": [
818    {
819     "name": "stdout",
820     "output_type": "stream",
821     "text": [
822      "edges[1].src=0, edges[1].dst=0\n",
823      "edges[2].src=0, edges[2].dst=0\n",
824      "edges[3].src=0, edges[3].dst=1\n",
825      "edges[4].src=0, edges[4].dst=1\n"
826     ]
827    }
828   ],
829   "source": [
830    "for ed in aut.out(0):\n",
831    "    print(\"edges[{e}].src={src}, edges[{e}].dst={dst}\".format(e=aut.edge_number(ed), src=ed.src, dst=ed.dst))"
832   ]
833  },
834  {
835   "cell_type": "markdown",
836   "metadata": {},
837   "source": [
838    "The other fields of the `edges` vector probably speak for themselves. `cond` is a BDD representing the boolean combination of atomic propositions expected by the edge, `acc` is an instance of `spot::acc_cond::mark_t`, i.e., a bit set representing the set of acceptance sets the edge belongs to, `src` and `dst` are the source and destination of the transition.  Of course when iterating over the successors of a state with `aut.out(src)`, the source is well known, but there are other situations where it is convenient to retrieve the source from the edge (e.g., when iterating over all edges of an automaton, or when storing edges indices for later processing).\n",
839    "\n",
840    "You can access one column of the `edges` vector using the `edge_storage()` method.  For instance let's modify edge 3:"
841   ]
842  },
843  {
844   "cell_type": "code",
845   "execution_count": 8,
846   "metadata": {},
847   "outputs": [
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1195    "aut.edge_storage(3).acc.set(1)\n",
1196    "aut.edge_storage(3).dst = 0\n",
1197    "display(aut)\n",
1198    "aut.show_storage(\"v\")"
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1200  },
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1204   "source": [
1205    "Having the source into the `edges` vector also allows us to easily sort that vector to put all sibling transitions (i.e., transition leaving the same state) together to improve data locality.  The `merge_edges()` method will do that and a bit more: edges are first sorted by (`src`, `dst`, `acc`) making possible to merge the `cond` field of edges with identical (`src`, `dst`, `acc`).  On Fin-less automata (not our example), the a second pass is perform to sort the edge (`src`, `dst`, `cond`) and then merge the `acc` fields of edges that share the other fields.\n",
1206    "\n",
1207    "In our example, `merge_edges()` will merge edges 1 and 3."
1208   ]
1209  },
1210  {
1211   "cell_type": "code",
1212   "execution_count": 9,
1213   "metadata": {},
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1532     "metadata": {},
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1534    }
1535   ],
1536   "source": [
1537    "aut.merge_edges()\n",
1538    "display(aut, aut.show_storage(\"v\"))"
1539   ]
1540  },
1541  {
1542   "cell_type": "markdown",
1543   "metadata": {},
1544   "source": [
1545    "Note that the `succ_tail` field of the `states` vector is seldom used when reading automata as the linked list of edges ends when `next_succ` (or `succ`) equals `0`.  Its main use is during calls to `new_edge()`: new edges are always created at the end of the list (otherwise it would be hard to preserve the order of edges when parsing and automaton and printing it)."
1546   ]
1547  },
1548  {
1549   "cell_type": "markdown",
1550   "metadata": {},
1551   "source": [
1552    "# The property-update issue\n",
1553    "\n",
1554    "Properties like `prop_complete()`, `prop_universal()`, and the like are normally updated by algorithms that modify the automaton in place.  They are not updated when we modify the automaton using low-level methods like `new_state()` or `new_edges()` as we have done so far.\n",
1555    "\n",
1556    "For instance we could add a new edge to the automaton to introduce some non-determinism, and the automaton would still pretend it is universal."
1557   ]
1558  },
1559  {
1560   "cell_type": "code",
1561   "execution_count": 10,
1562   "metadata": {},
1563   "outputs": [
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1898       "</g>\n",
1899       "<!-- meta -->\n",
1900       "<g id=\"node3\" class=\"node\">\n",
1901       "<title>meta</title>\n",
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1911       "</g>\n",
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1936       "</g>\n",
1937       "<!-- props&#45;&gt;edges -->\n",
1938       "</g>\n",
1939       "</svg>\n"
1940      ],
1941      "text/plain": [
1942       "<spot.jupyter.SVG object>"
1943      ]
1944     },
1945     "metadata": {},
1946     "output_type": "display_data"
1947    }
1948   ],
1949   "source": [
1950    "aut.new_edge(1, 1, buddy.bddtrue, [1, 0])\n",
1951    "display(aut, aut.show_storage())"
1952   ]
1953  },
1954  {
1955   "cell_type": "markdown",
1956   "metadata": {},
1957   "source": [
1958    "Such an inconsistency will cause many issues when the automaton is passed to algorithm with specialized handling of universal automata.  When writing an algorithm that modify the automaton, it is your responsibility to update the property bits as well.  In this case it could be fixed by calling `aut.prop_universal(False); aut.prop_unambiguous(spot.trival_maybe()); ...` for each property, or by reseting all properties to `maybe` with `prop_reset()`:"
1959   ]
1960  },
1961  {
1962   "cell_type": "code",
1963   "execution_count": 11,
1964   "metadata": {},
1965   "outputs": [
1966    {
1967     "data": {
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2007      "text/plain": [
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2010     },
2011     "execution_count": 11,
2012     "metadata": {},
2013     "output_type": "execute_result"
2014    }
2015   ],
2016   "source": [
2017    "aut.prop_reset()\n",
2018    "aut.show_storage(\"p\")  # \"p\" displays only the properties"
2019   ]
2020  },
2021  {
2022   "cell_type": "markdown",
2023   "metadata": {},
2024   "source": [
2025    "# Erasing edges\n",
2026    "\n",
2027    "Erasing a single edge, denoted by its edge index `i`, is not convenient because of the linked structure of the edges: the `next_succ` of the previous (but unknown given `i`) edge would have to be updated (or maybe the `succ` or `succ_tail` fields of `states` vector have to be updated).\n",
2028    "\n",
2029    "The `out_iteraser(s)` method provides a way to iterate over the outgoing edges of state `s` that allows erasing edges.  The iteration does not follow the usual Python pattern because once you have looked at the current edge using `current()`, you have two choices: `advance()` to the next one, or `erase()` the current one (and advance to the next). Note that `it.current()` and `it.advance()` are written `*it` and `++it` in C++.\n",
2030    "\n",
2031    "The following example erases all the outgoing transitions of state `0` that belong to acceptance set `1`."
2032   ]
2033  },
2034  {
2035   "cell_type": "code",
2036   "execution_count": 12,
2037   "metadata": {},
2038   "outputs": [
2039    {
2040     "name": "stdout",
2041     "output_type": "stream",
2042     "text": [
2043      "pos=1, acc={0}, toerase=False\n",
2044      "pos=2, acc={1}, toerase=True\n",
2045      "pos=3, acc={0}, toerase=False\n"
2046     ]
2047    }
2048   ],
2049   "source": [
2050    "it = aut.out_iteraser(0)\n",
2051    "while it:\n",
2052    "    e = it.current()\n",
2053    "    toerase = e.acc.has(1)\n",
2054    "    print(\"pos={}, acc={}, toerase={}\".format(aut.edge_number(e), e.acc, toerase))\n",
2055    "    if toerase:\n",
2056    "        it.erase()\n",
2057    "    else:\n",
2058    "        it.advance()"
2059   ]
2060  },
2061  {
2062   "cell_type": "code",
2063   "execution_count": 13,
2064   "metadata": {},
2065   "outputs": [
2066    {
2067     "data": {
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2074       "<!-- Title: g Pages: 1 -->\n",
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2117       "</g>\n",
2118       "<!-- edges -->\n",
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2120       "<title>edges</title>\n",
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2283     "execution_count": 13,
2284     "metadata": {},
2285     "output_type": "execute_result"
2286    }
2287   ],
2288   "source": [
2289    "aut.show_storage(\"v\")"
2290   ]
2291  },
2292  {
2293   "cell_type": "markdown",
2294   "metadata": {},
2295   "source": [
2296    "Notice that the edges vector hasn't been resized, as doing so would renumber edges.  Instead, erased edges have removed from the linked list of outgoing edges of `0`, and their `next_succ` field has been changed to point to themselves. \n",
2297    "\n",
2298    "You can test whether an edges has been erased with `is_dead_edge()`:"
2299   ]
2300  },
2301  {
2302   "cell_type": "code",
2303   "execution_count": 14,
2304   "metadata": {},
2305   "outputs": [
2306    {
2307     "data": {
2308      "text/plain": [
2309       "True"
2310      ]
2311     },
2312     "execution_count": 14,
2313     "metadata": {},
2314     "output_type": "execute_result"
2315    }
2316   ],
2317   "source": [
2318    "aut.is_dead_edge(2)"
2319   ]
2320  },
2321  {
2322   "cell_type": "markdown",
2323   "metadata": {},
2324   "source": [
2325    "However you usually do not have to care, because iterator methods will skip such dead edges.  For instance:"
2326   ]
2327  },
2328  {
2329   "cell_type": "code",
2330   "execution_count": 15,
2331   "metadata": {},
2332   "outputs": [
2333    {
2334     "name": "stdout",
2335     "output_type": "stream",
2336     "text": [
2337      "edges[1].src=0, edges[1].dst=0\n",
2338      "edges[3].src=0, edges[3].dst=1\n",
2339      "edges[4].src=1, edges[4].dst=0\n",
2340      "edges[5].src=1, edges[5].dst=0\n",
2341      "edges[6].src=1, edges[6].dst=1\n",
2342      "edges[7].src=1, edges[7].dst=1\n",
2343      "edges[8].src=2, edges[8].dst=0\n",
2344      "edges[9].src=1, edges[9].dst=1\n"
2345     ]
2346    }
2347   ],
2348   "source": [
2349    "for e in aut.edges():  # iterate over all non-erased edges\n",
2350    "    print(\"edges[{e}].src={src}, edges[{e}].dst={dst}\".format(e=aut.edge_number(e), src=e.src, dst=e.dst))"
2351   ]
2352  },
2353  {
2354   "cell_type": "markdown",
2355   "metadata": {},
2356   "source": [
2357    "Similarly, `num_edges()` returns the count of non-erased edges."
2358   ]
2359  },
2360  {
2361   "cell_type": "code",
2362   "execution_count": 16,
2363   "metadata": {},
2364   "outputs": [
2365    {
2366     "data": {
2367      "text/plain": [
2368       "8"
2369      ]
2370     },
2371     "execution_count": 16,
2372     "metadata": {},
2373     "output_type": "execute_result"
2374    }
2375   ],
2376   "source": [
2377    "aut.num_edges()"
2378   ]
2379  },
2380  {
2381   "cell_type": "markdown",
2382   "metadata": {},
2383   "source": [
2384    "Erased edges are actually removed by `merge_edges()`:"
2385   ]
2386  },
2387  {
2388   "cell_type": "code",
2389   "execution_count": 17,
2390   "metadata": {},
2391   "outputs": [
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2597   ],
2598   "source": [
2599    "aut.merge_edges()\n",
2600    "aut.show_storage(\"v\")"
2601   ]
2602  },
2603  {
2604   "cell_type": "markdown",
2605   "metadata": {},
2606   "source": [
2607    "Another way to erase an edge, is to set its `cond` field to `bddfalse`.  Strictly speaking, this does not really erase the edge, and it will still be iterated upon.  However a subsequent call to `merge_edges()` will perform the removal of that edge."
2608   ]
2609  },
2610  {
2611   "cell_type": "code",
2612   "execution_count": 18,
2613   "metadata": {},
2614   "outputs": [
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2808       "</g>\n",
2809       "</g>\n",
2810       "</svg>\n"
2811      ],
2812      "text/plain": [
2813       "<spot.jupyter.SVG object>"
2814      ]
2815     },
2816     "execution_count": 18,
2817     "metadata": {},
2818     "output_type": "execute_result"
2819    }
2820   ],
2821   "source": [
2822    "aut.edge_storage(3).cond = buddy.bddfalse\n",
2823    "aut.show_storage(\"v\")"
2824   ]
2825  },
2826  {
2827   "cell_type": "code",
2828   "execution_count": 19,
2829   "metadata": {},
2830   "outputs": [
2831    {
2832     "name": "stdout",
2833     "output_type": "stream",
2834     "text": [
2835      "edges[1].src=0, edges[1].dst=0\n",
2836      "edges[2].src=0, edges[2].dst=1\n",
2837      "edges[3].src=1, edges[3].dst=0\n",
2838      "edges[4].src=1, edges[4].dst=0\n",
2839      "edges[5].src=1, edges[5].dst=1\n",
2840      "edges[6].src=1, edges[6].dst=1\n",
2841      "edges[7].src=1, edges[7].dst=1\n",
2842      "edges[8].src=2, edges[8].dst=0\n"
2843     ]
2844    }
2845   ],
2846   "source": [
2847    "for e in aut.edges():  # iterate over all non-erased edges\n",
2848    "    print(\"edges[{e}].src={src}, edges[{e}].dst={dst}\".format(e=aut.edge_number(e), src=e.src, dst=e.dst))"
2849   ]
2850  },
2851  {
2852   "cell_type": "code",
2853   "execution_count": 20,
2854   "metadata": {},
2855   "outputs": [
2856    {
2857     "data": {
2858      "text/plain": [
2859       "False"
2860      ]
2861     },
2862     "execution_count": 20,
2863     "metadata": {},
2864     "output_type": "execute_result"
2865    }
2866   ],
2867   "source": [
2868    "aut.is_dead_edge(3)"
2869   ]
2870  },
2871  {
2872   "cell_type": "code",
2873   "execution_count": 21,
2874   "metadata": {},
2875   "outputs": [
2876    {
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3056      ],
3057      "text/plain": [
3058       "<spot.jupyter.SVG object>"
3059      ]
3060     },
3061     "execution_count": 21,
3062     "metadata": {},
3063     "output_type": "execute_result"
3064    }
3065   ],
3066   "source": [
3067    "aut.merge_edges()\n",
3068    "aut.show_storage(\"v\")"
3069   ]
3070  },
3071  {
3072   "cell_type": "markdown",
3073   "metadata": {},
3074   "source": [
3075    "# Alternation\n",
3076    "\n",
3077    "The data structures seen so far only support a single destination per edge.  Support for universal branching therefore calls for something new.\n",
3078    "\n",
3079    "Let's add some universal branching in our example automaton."
3080   ]
3081  },
3082  {
3083   "cell_type": "code",
3084   "execution_count": 22,
3085   "metadata": {},
3086   "outputs": [
3087    {
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3248      ]
3249     },
3250     "execution_count": 22,
3251     "metadata": {},
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3253    }
3254   ],
3255   "source": [
3256    "a = buddy.bdd_ithvar(aut.register_ap('a'))\n",
3257    "s = aut.new_state()\n",
3258    "aut.new_univ_edge(0, [0, s], a, [1])\n",
3259    "aut.new_univ_edge(s, [0, 1], -a, [0])\n",
3260    "aut"
3261   ]
3262  },
3263  {
3264   "cell_type": "code",
3265   "execution_count": 23,
3266   "metadata": {},
3267   "outputs": [
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3427       "<text text-anchor=\"start\" x=\"521.5\" y=\"-286.8\" font-family=\"Times,serif\" font-size=\"14.00\">~0</text>\n",
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3485       "</g>\n",
3486       "<!-- dests -->\n",
3487       "<g id=\"node3\" class=\"node\">\n",
3488       "<title>dests</title>\n",
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3520       "</g>\n",
3521       "<!-- meta -->\n",
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3523       "<title>meta</title>\n",
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3527       "<text text-anchor=\"start\" x=\"10.5\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">num_sets:</text>\n",
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3529       "<text text-anchor=\"start\" x=\"10.5\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">acceptance:</text>\n",
3530       "<text text-anchor=\"start\" x=\"78.5\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">Fin(0) &amp; Inf(1)</text>\n",
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3533       "</g>\n",
3534       "<!-- meta&#45;&gt;states -->\n",
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3558       "</g>\n",
3559       "<!-- props&#45;&gt;edges -->\n",
3560       "</g>\n",
3561       "</svg>\n"
3562      ],
3563      "text/plain": [
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3565      ]
3566     },
3567     "execution_count": 23,
3568     "metadata": {},
3569     "output_type": "execute_result"
3570    }
3571   ],
3572   "source": [
3573    "aut.show_storage()"
3574   ]
3575  },
3576  {
3577   "cell_type": "markdown",
3578   "metadata": {},
3579   "source": [
3580    "Here we have created two universal transitions: `0->[0,2]` and `2->[0,1]`.  The destination groups `[0,2]` and `[0,1]`  are stored in a integer vector called `dests`.  Each group is encoded by its size immediately followed by the state numbers of the destinations.  So group `[0,2]` get encoded as `2,0,2` at position `0` of `dests`, and group `[0,1]` is encoded as `2,0,1` at position `3`.  Each group is denoted by the index of its size in the `dests` vector.  When an edge targets a destination group, the complement of that destination index is written in the `dst` field of the `edges` entry, hence that `~0` and `~3` that appear here.  Using a complement like this allows us to quickly detect universal edges by looking at the sign bit if their `dst` entry.\n",
3581    "\n",
3582    "To work on alternating automata, one can no longuer just blindingly use the `dst` field of outgoing iterations:"
3583   ]
3584  },
3585  {
3586   "cell_type": "code",
3587   "execution_count": 24,
3588   "metadata": {},
3589   "outputs": [
3590    {
3591     "name": "stdout",
3592     "output_type": "stream",
3593     "text": [
3594      "0\n",
3595      "1\n",
3596      "0\n",
3597      "1\n",
3598      "1\n",
3599      "1\n",
3600      "0\n",
3601      "4294967295\n",
3602      "4294967292\n"
3603     ]
3604    }
3605   ],
3606   "source": [
3607    "for e in aut.edges():\n",
3608    "    print(e.dst)"
3609   ]
3610  },
3611  {
3612   "cell_type": "markdown",
3613   "metadata": {},
3614   "source": [
3615    "Using such a large `e.dst` value as an index in `states` would likely crash the program.  Instead we should iterate over all the successor of an edge using the `univ_dests()` method.  Note that `univ_dests()` can be applied to regular edges as well."
3616   ]
3617  },
3618  {
3619   "cell_type": "code",
3620   "execution_count": 25,
3621   "metadata": {},
3622   "outputs": [
3623    {
3624     "name": "stdout",
3625     "output_type": "stream",
3626     "text": [
3627      "[0]\n",
3628      "[1]\n",
3629      "[0]\n",
3630      "[1]\n",
3631      "[1]\n",
3632      "[1]\n",
3633      "[0]\n",
3634      "[0, 3]\n",
3635      "[0, 1]\n"
3636     ]
3637    }
3638   ],
3639   "source": [
3640    "for e in aut.edges():\n",
3641    "    print([d for d in aut.univ_dests(e.dst)])"
3642   ]
3643  },
3644  {
3645   "cell_type": "markdown",
3646   "metadata": {},
3647   "source": [
3648    "Note that `univ_dests()` can be applied to `e.dst` or `e`."
3649   ]
3650  },
3651  {
3652   "cell_type": "code",
3653   "execution_count": 26,
3654   "metadata": {},
3655   "outputs": [
3656    {
3657     "name": "stdout",
3658     "output_type": "stream",
3659     "text": [
3660      "[0]\n",
3661      "[1]\n",
3662      "[0]\n",
3663      "[1]\n",
3664      "[1]\n",
3665      "[1]\n",
3666      "[0]\n",
3667      "[0, 3]\n",
3668      "[0, 1]\n"
3669     ]
3670    }
3671   ],
3672   "source": [
3673    "for e in aut.edges():\n",
3674    "    print([d for d in aut.univ_dests(e)])"
3675   ]
3676  },
3677  {
3678   "cell_type": "markdown",
3679   "metadata": {},
3680   "source": [
3681    "Note that the initial state get also use universal branching:"
3682   ]
3683  },
3684  {
3685   "cell_type": "code",
3686   "execution_count": 27,
3687   "metadata": {},
3688   "outputs": [],
3689   "source": [
3690    "aut.set_univ_init_state([0, 1, 2])"
3691   ]
3692  },
3693  {
3694   "cell_type": "code",
3695   "execution_count": 28,
3696   "metadata": {},
3697   "outputs": [
3698    {
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3752       "</g>\n",
3753       "<!-- 2 -->\n",
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3755       "<title>2</title>\n",
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3758       "</g>\n",
3759       "<!-- &#45;7&#45;&gt;2 -->\n",
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3764       "</g>\n",
3765       "<!-- 0&#45;&gt;0 -->\n",
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3767       "<title>0&#45;&gt;0</title>\n",
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3771       "<text text-anchor=\"start\" x=\"169.6\" y=\"-137.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
3772       "</g>\n",
3773       "<!-- 0&#45;&gt;1 -->\n",
3774       "<g id=\"edge6\" class=\"edge\">\n",
3775       "<title>0&#45;&gt;1</title>\n",
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3780       "</g>\n",
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3782       "<g id=\"node6\" class=\"node\">\n",
3783       "<title>&#45;1</title>\n",
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3788       "<title>0&#45;&gt;&#45;1</title>\n",
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3792       "<text text-anchor=\"start\" x=\"213.6\" y=\"-110.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#ff4da0\">❶</text>\n",
3793       "</g>\n",
3794       "<!-- 1&#45;&gt;0 -->\n",
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3796       "<title>1&#45;&gt;0</title>\n",
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3800       "<text text-anchor=\"start\" x=\"300.7\" y=\"-49.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
3801       "</g>\n",
3802       "<!-- 1&#45;&gt;1 -->\n",
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3804       "<title>1&#45;&gt;1</title>\n",
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3809       "</g>\n",
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3812       "<title>1&#45;&gt;1</title>\n",
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3820       "<title>1&#45;&gt;1</title>\n",
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3826       "</g>\n",
3827       "<!-- 2&#45;&gt;0 -->\n",
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3829       "<title>2&#45;&gt;0</title>\n",
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3833       "</g>\n",
3834       "<!-- &#45;1&#45;&gt;0 -->\n",
3835       "<g id=\"edge8\" class=\"edge\">\n",
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3839       "</g>\n",
3840       "<!-- 3 -->\n",
3841       "<g id=\"node7\" class=\"node\">\n",
3842       "<title>3</title>\n",
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3845       "</g>\n",
3846       "<!-- &#45;1&#45;&gt;3 -->\n",
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3851       "</g>\n",
3852       "<!-- &#45;4 -->\n",
3853       "<g id=\"node8\" class=\"node\">\n",
3854       "<title>&#45;4</title>\n",
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3856       "</g>\n",
3857       "<!-- 3&#45;&gt;&#45;4 -->\n",
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3863       "<text text-anchor=\"start\" x=\"347.2\" y=\"-115.8\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
3864       "</g>\n",
3865       "<!-- &#45;4&#45;&gt;0 -->\n",
3866       "<g id=\"edge16\" class=\"edge\">\n",
3867       "<title>&#45;4&#45;&gt;0</title>\n",
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3876       "</g>\n",
3877       "</g>\n",
3878       "</svg>\n"
3879      ],
3880      "text/plain": [
3881       "<spot.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fd3c40c2b70> >"
3882      ]
3883     },
3884     "execution_count": 28,
3885     "metadata": {},
3886     "output_type": "execute_result"
3887    }
3888   ],
3889   "source": [
3890    "aut"
3891   ]
3892  },
3893  {
3894   "cell_type": "code",
3895   "execution_count": 29,
3896   "metadata": {},
3897   "outputs": [
3898    {
3899     "name": "stdout",
3900     "output_type": "stream",
3901     "text": [
3902      "[0, 1, 2]\n"
3903     ]
3904    }
3905   ],
3906   "source": [
3907    "print([d for d in aut.univ_dests(aut.get_init_state_number())])"
3908   ]
3909  },
3910  {
3911   "cell_type": "code",
3912   "execution_count": 30,
3913   "metadata": {},
3914   "outputs": [
3915    {
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4132       "</g>\n",
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4135       "<title>dests</title>\n",
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4160       "<polygon fill=\"none\" stroke=\"black\" points=\"673.5,-280 673.5,-301 686.5,-301 686.5,-280 673.5,-280\"/>\n",
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4163       "<polygon fill=\"none\" stroke=\"black\" points=\"686.5,-280 686.5,-301 699.5,-301 699.5,-280 686.5,-280\"/>\n",
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4165       "<polygon fill=\"none\" stroke=\"black\" points=\"699.5,-280 699.5,-301 720.5,-301 720.5,-280 699.5,-280\"/>\n",
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4191       "<text text-anchor=\"start\" x=\"10.5\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">num_sets:</text>\n",
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4193       "<text text-anchor=\"start\" x=\"10.5\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">acceptance:</text>\n",
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4230     },
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4232     "metadata": {},
4233     "output_type": "execute_result"
4234    }
4235   ],
4236   "source": [
4237    "aut.show_storage()"
4238   ]
4239  },
4240  {
4241   "cell_type": "markdown",
4242   "metadata": {},
4243   "source": [
4244    "Adding several transitions with the same destination groups may result in duplicates in the `dests` vector.   Those groups get merged during `merge_edges()`."
4245   ]
4246  },
4247  {
4248   "cell_type": "code",
4249   "execution_count": 31,
4250   "metadata": {},
4251   "outputs": [
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4587       "<polygon fill=\"none\" stroke=\"black\" points=\"239.5,-187 239.5,-208 282.5,-208 282.5,-187 239.5,-187\"/>\n",
4588       "<text text-anchor=\"start\" x=\"250.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">{0}</text>\n",
4589       "<polygon fill=\"none\" stroke=\"black\" points=\"282.5,-187 282.5,-208 329.5,-208 329.5,-187 282.5,-187\"/>\n",
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4591       "<polygon fill=\"none\" stroke=\"black\" points=\"329.5,-187 329.5,-208 372.5,-208 372.5,-187 329.5,-187\"/>\n",
4592       "<text text-anchor=\"start\" x=\"340.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">{0}</text>\n",
4593       "<polygon fill=\"none\" stroke=\"black\" points=\"372.5,-187 372.5,-208 419.5,-208 419.5,-187 372.5,-187\"/>\n",
4594       "<text text-anchor=\"start\" x=\"385.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">{0}</text>\n",
4595       "<polygon fill=\"none\" stroke=\"black\" points=\"419.5,-187 419.5,-208 462.5,-208 462.5,-187 419.5,-187\"/>\n",
4596       "<text text-anchor=\"start\" x=\"430.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">{1}</text>\n",
4597       "<polygon fill=\"none\" stroke=\"black\" points=\"462.5,-187 462.5,-208 499.5,-208 499.5,-187 462.5,-187\"/>\n",
4598       "<text text-anchor=\"start\" x=\"465.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">{0,1}</text>\n",
4599       "<polygon fill=\"none\" stroke=\"black\" points=\"499.5,-187 499.5,-208 519.5,-208 519.5,-187 499.5,-187\"/>\n",
4600       "<text text-anchor=\"start\" x=\"502.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">{}</text>\n",
4601       "<polygon fill=\"none\" stroke=\"black\" points=\"519.5,-187 519.5,-208 546.5,-208 546.5,-187 519.5,-187\"/>\n",
4602       "<text text-anchor=\"start\" x=\"522.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">{1}</text>\n",
4603       "<polygon fill=\"none\" stroke=\"black\" points=\"546.5,-187 546.5,-208 573.5,-208 573.5,-187 546.5,-187\"/>\n",
4604       "<text text-anchor=\"start\" x=\"549.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">{0}</text>\n",
4605       "<polygon fill=\"none\" stroke=\"black\" points=\"573.5,-187 573.5,-208 601.5,-208 601.5,-187 573.5,-187\"/>\n",
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4607       "<polygon fill=\"none\" stroke=\"black\" points=\"178.5,-166 178.5,-187 239.5,-187 239.5,-166 178.5,-166\"/>\n",
4608       "<text text-anchor=\"start\" x=\"201\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">dst</text>\n",
4609       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"239.5,-166 239.5,-187 282.5,-187 282.5,-166 239.5,-166\"/>\n",
4610       "<polygon fill=\"none\" stroke=\"black\" points=\"239.5,-166 239.5,-187 282.5,-187 282.5,-166 239.5,-166\"/>\n",
4611       "<text text-anchor=\"start\" x=\"257.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4612       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"282.5,-166 282.5,-187 329.5,-187 329.5,-166 282.5,-166\"/>\n",
4613       "<polygon fill=\"none\" stroke=\"black\" points=\"282.5,-166 282.5,-187 329.5,-187 329.5,-166 282.5,-166\"/>\n",
4614       "<text text-anchor=\"start\" x=\"302.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
4615       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"329.5,-166 329.5,-187 372.5,-187 372.5,-166 329.5,-166\"/>\n",
4616       "<polygon fill=\"none\" stroke=\"black\" points=\"329.5,-166 329.5,-187 372.5,-187 372.5,-166 329.5,-166\"/>\n",
4617       "<text text-anchor=\"start\" x=\"347.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4618       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"372.5,-166 372.5,-187 419.5,-187 419.5,-166 372.5,-166\"/>\n",
4619       "<polygon fill=\"none\" stroke=\"black\" points=\"372.5,-166 372.5,-187 419.5,-187 419.5,-166 372.5,-166\"/>\n",
4620       "<text text-anchor=\"start\" x=\"392.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
4621       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"419.5,-166 419.5,-187 462.5,-187 462.5,-166 419.5,-166\"/>\n",
4622       "<polygon fill=\"none\" stroke=\"black\" points=\"419.5,-166 419.5,-187 462.5,-187 462.5,-166 419.5,-166\"/>\n",
4623       "<text text-anchor=\"start\" x=\"437.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
4624       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"462.5,-166 462.5,-187 499.5,-187 499.5,-166 462.5,-166\"/>\n",
4625       "<polygon fill=\"none\" stroke=\"black\" points=\"462.5,-166 462.5,-187 499.5,-187 499.5,-166 462.5,-166\"/>\n",
4626       "<text text-anchor=\"start\" x=\"477.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
4627       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"499.5,-166 499.5,-187 519.5,-187 519.5,-166 499.5,-166\"/>\n",
4628       "<polygon fill=\"none\" stroke=\"black\" points=\"499.5,-166 499.5,-187 519.5,-187 519.5,-166 499.5,-166\"/>\n",
4629       "<text text-anchor=\"start\" x=\"506\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4630       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"519.5,-166 519.5,-187 546.5,-187 546.5,-166 519.5,-166\"/>\n",
4631       "<polygon fill=\"none\" stroke=\"black\" points=\"519.5,-166 519.5,-187 546.5,-187 546.5,-166 519.5,-166\"/>\n",
4632       "<text text-anchor=\"start\" x=\"525.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">~0</text>\n",
4633       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"546.5,-166 546.5,-187 573.5,-187 573.5,-166 546.5,-166\"/>\n",
4634       "<polygon fill=\"none\" stroke=\"black\" points=\"546.5,-166 546.5,-187 573.5,-187 573.5,-166 546.5,-166\"/>\n",
4635       "<text text-anchor=\"start\" x=\"552.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">~3</text>\n",
4636       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"573.5,-166 573.5,-187 601.5,-187 601.5,-166 573.5,-166\"/>\n",
4637       "<polygon fill=\"none\" stroke=\"black\" points=\"573.5,-166 573.5,-187 601.5,-187 601.5,-166 573.5,-166\"/>\n",
4638       "<text text-anchor=\"start\" x=\"576.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">~10</text>\n",
4639       "<polygon fill=\"none\" stroke=\"black\" points=\"178.5,-145 178.5,-166 239.5,-166 239.5,-145 178.5,-145\"/>\n",
4640       "<text text-anchor=\"start\" x=\"181.5\" y=\"-151.8\" font-family=\"Times,serif\" font-size=\"14.00\">next_succ</text>\n",
4641       "<polygon fill=\"cyan\" stroke=\"transparent\" points=\"239.5,-145 239.5,-166 282.5,-166 282.5,-145 239.5,-145\"/>\n",
4642       "<polygon fill=\"none\" stroke=\"black\" points=\"239.5,-145 239.5,-166 282.5,-166 282.5,-145 239.5,-145\"/>\n",
4643       "<text text-anchor=\"start\" x=\"257.5\" y=\"-151.8\" font-family=\"Times,serif\" font-size=\"14.00\">2</text>\n",
4644       "<polygon fill=\"cyan\" stroke=\"transparent\" points=\"282.5,-145 282.5,-166 329.5,-166 329.5,-145 282.5,-145\"/>\n",
4645       "<polygon fill=\"none\" stroke=\"black\" points=\"282.5,-145 282.5,-166 329.5,-166 329.5,-145 282.5,-145\"/>\n",
4646       "<text text-anchor=\"start\" x=\"302.5\" y=\"-151.8\" font-family=\"Times,serif\" font-size=\"14.00\">8</text>\n",
4647       "<polygon fill=\"cyan\" stroke=\"transparent\" points=\"329.5,-145 329.5,-166 372.5,-166 372.5,-145 329.5,-145\"/>\n",
4648       "<polygon fill=\"none\" stroke=\"black\" points=\"329.5,-145 329.5,-166 372.5,-166 372.5,-145 329.5,-145\"/>\n",
4649       "<text text-anchor=\"start\" x=\"347.5\" y=\"-151.8\" font-family=\"Times,serif\" font-size=\"14.00\">4</text>\n",
4650       "<polygon fill=\"cyan\" stroke=\"transparent\" points=\"372.5,-145 372.5,-166 419.5,-166 419.5,-145 372.5,-145\"/>\n",
4651       "<polygon fill=\"none\" stroke=\"black\" points=\"372.5,-145 372.5,-166 419.5,-166 419.5,-145 372.5,-145\"/>\n",
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4653       "<polygon fill=\"cyan\" stroke=\"transparent\" points=\"419.5,-145 419.5,-166 462.5,-166 462.5,-145 419.5,-145\"/>\n",
4654       "<polygon fill=\"none\" stroke=\"black\" points=\"419.5,-145 419.5,-166 462.5,-166 462.5,-145 419.5,-145\"/>\n",
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4656       "<polygon fill=\"none\" stroke=\"black\" points=\"462.5,-145 462.5,-166 499.5,-166 499.5,-145 462.5,-145\"/>\n",
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4658       "<polygon fill=\"none\" stroke=\"black\" points=\"499.5,-145 499.5,-166 519.5,-166 519.5,-145 499.5,-145\"/>\n",
4659       "<text text-anchor=\"start\" x=\"506\" y=\"-151.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4660       "<polygon fill=\"none\" stroke=\"black\" points=\"519.5,-145 519.5,-166 546.5,-166 546.5,-145 519.5,-145\"/>\n",
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4662       "<polygon fill=\"cyan\" stroke=\"transparent\" points=\"546.5,-145 546.5,-166 573.5,-166 573.5,-145 546.5,-145\"/>\n",
4663       "<polygon fill=\"none\" stroke=\"black\" points=\"546.5,-145 546.5,-166 573.5,-166 573.5,-145 546.5,-145\"/>\n",
4664       "<text text-anchor=\"start\" x=\"553\" y=\"-151.8\" font-family=\"Times,serif\" font-size=\"14.00\">10</text>\n",
4665       "<polygon fill=\"none\" stroke=\"black\" points=\"573.5,-145 573.5,-166 601.5,-166 601.5,-145 573.5,-145\"/>\n",
4666       "<text text-anchor=\"start\" x=\"584\" y=\"-151.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4667       "<polygon fill=\"none\" stroke=\"black\" points=\"178.5,-124 178.5,-145 239.5,-145 239.5,-124 178.5,-124\"/>\n",
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4670       "<polygon fill=\"none\" stroke=\"black\" points=\"239.5,-124 239.5,-145 282.5,-145 282.5,-124 239.5,-124\"/>\n",
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4673       "<polygon fill=\"none\" stroke=\"black\" points=\"282.5,-124 282.5,-145 329.5,-145 329.5,-124 282.5,-124\"/>\n",
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4675       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"329.5,-124 329.5,-145 372.5,-145 372.5,-124 329.5,-124\"/>\n",
4676       "<polygon fill=\"none\" stroke=\"black\" points=\"329.5,-124 329.5,-145 372.5,-145 372.5,-124 329.5,-124\"/>\n",
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4679       "<polygon fill=\"none\" stroke=\"black\" points=\"372.5,-124 372.5,-145 419.5,-145 419.5,-124 372.5,-124\"/>\n",
4680       "<text text-anchor=\"start\" x=\"392.5\" y=\"-130.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
4681       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"419.5,-124 419.5,-145 462.5,-145 462.5,-124 419.5,-124\"/>\n",
4682       "<polygon fill=\"none\" stroke=\"black\" points=\"419.5,-124 419.5,-145 462.5,-145 462.5,-124 419.5,-124\"/>\n",
4683       "<text text-anchor=\"start\" x=\"437.5\" y=\"-130.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
4684       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"462.5,-124 462.5,-145 499.5,-145 499.5,-124 462.5,-124\"/>\n",
4685       "<polygon fill=\"none\" stroke=\"black\" points=\"462.5,-124 462.5,-145 499.5,-145 499.5,-124 462.5,-124\"/>\n",
4686       "<text text-anchor=\"start\" x=\"477.5\" y=\"-130.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
4687       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"499.5,-124 499.5,-145 519.5,-145 519.5,-124 499.5,-124\"/>\n",
4688       "<polygon fill=\"none\" stroke=\"black\" points=\"499.5,-124 499.5,-145 519.5,-145 519.5,-124 499.5,-124\"/>\n",
4689       "<text text-anchor=\"start\" x=\"506\" y=\"-130.8\" font-family=\"Times,serif\" font-size=\"14.00\">2</text>\n",
4690       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"519.5,-124 519.5,-145 546.5,-145 546.5,-124 519.5,-124\"/>\n",
4691       "<polygon fill=\"none\" stroke=\"black\" points=\"519.5,-124 519.5,-145 546.5,-145 546.5,-124 519.5,-124\"/>\n",
4692       "<text text-anchor=\"start\" x=\"529.5\" y=\"-130.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4693       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"546.5,-124 546.5,-145 573.5,-145 573.5,-124 546.5,-124\"/>\n",
4694       "<polygon fill=\"none\" stroke=\"black\" points=\"546.5,-124 546.5,-145 573.5,-145 573.5,-124 546.5,-124\"/>\n",
4695       "<text text-anchor=\"start\" x=\"556.5\" y=\"-130.8\" font-family=\"Times,serif\" font-size=\"14.00\">3</text>\n",
4696       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"573.5,-124 573.5,-145 601.5,-145 601.5,-124 573.5,-124\"/>\n",
4697       "<polygon fill=\"none\" stroke=\"black\" points=\"573.5,-124 573.5,-145 601.5,-145 601.5,-124 573.5,-124\"/>\n",
4698       "<text text-anchor=\"start\" x=\"584\" y=\"-130.8\" font-family=\"Times,serif\" font-size=\"14.00\">3</text>\n",
4699       "</g>\n",
4700       "<!-- dests -->\n",
4701       "<g id=\"node3\" class=\"node\">\n",
4702       "<title>dests</title>\n",
4703       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"635.5,-187 635.5,-208 684.5,-208 684.5,-187 635.5,-187\"/>\n",
4704       "<polyline fill=\"none\" stroke=\"black\" points=\"635.5,-187 684.5,-187 \"/>\n",
4705       "<text text-anchor=\"start\" x=\"646\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">dests</text>\n",
4706       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"684.5,-187 684.5,-208 705.5,-208 705.5,-187 684.5,-187\"/>\n",
4707       "<polyline fill=\"none\" stroke=\"black\" points=\"684.5,-187 705.5,-187 \"/>\n",
4708       "<text text-anchor=\"start\" x=\"687.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">~0</text>\n",
4709       "<polyline fill=\"none\" stroke=\"black\" points=\"705.5,-187 718.5,-187 \"/>\n",
4710       "<polyline fill=\"none\" stroke=\"black\" points=\"718.5,-187 731.5,-187 \"/>\n",
4711       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"731.5,-187 731.5,-208 752.5,-208 752.5,-187 731.5,-187\"/>\n",
4712       "<polyline fill=\"none\" stroke=\"black\" points=\"731.5,-187 752.5,-187 \"/>\n",
4713       "<text text-anchor=\"start\" x=\"734.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">~3</text>\n",
4714       "<polyline fill=\"none\" stroke=\"black\" points=\"752.5,-187 765.5,-187 \"/>\n",
4715       "<polyline fill=\"none\" stroke=\"black\" points=\"765.5,-187 778.5,-187 \"/>\n",
4716       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"778.5,-187 778.5,-208 799.5,-208 799.5,-187 778.5,-187\"/>\n",
4717       "<polyline fill=\"none\" stroke=\"black\" points=\"778.5,-187 799.5,-187 \"/>\n",
4718       "<text text-anchor=\"start\" x=\"781.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">~6</text>\n",
4719       "<polyline fill=\"none\" stroke=\"black\" points=\"799.5,-187 812.5,-187 \"/>\n",
4720       "<polyline fill=\"none\" stroke=\"black\" points=\"812.5,-187 825.5,-187 \"/>\n",
4721       "<polyline fill=\"none\" stroke=\"black\" points=\"825.5,-187 838.5,-187 \"/>\n",
4722       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"838.5,-187 838.5,-208 866.5,-208 866.5,-187 838.5,-187\"/>\n",
4723       "<polyline fill=\"none\" stroke=\"black\" points=\"838.5,-187 866.5,-187 \"/>\n",
4724       "<text text-anchor=\"start\" x=\"841.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">~10</text>\n",
4725       "<polyline fill=\"none\" stroke=\"black\" points=\"866.5,-187 879.5,-187 \"/>\n",
4726       "<polyline fill=\"none\" stroke=\"black\" points=\"879.5,-187 892.5,-187 \"/>\n",
4727       "<polygon fill=\"none\" stroke=\"black\" points=\"635.5,-166 635.5,-187 684.5,-187 684.5,-166 635.5,-166\"/>\n",
4728       "<text text-anchor=\"start\" x=\"638.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">#cnt/dst</text>\n",
4729       "<polygon fill=\"none\" stroke=\"black\" points=\"684.5,-166 684.5,-187 705.5,-187 705.5,-166 684.5,-166\"/>\n",
4730       "<text text-anchor=\"start\" x=\"688\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">#2</text>\n",
4731       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"705.5,-166 705.5,-187 718.5,-187 718.5,-166 705.5,-166\"/>\n",
4732       "<polygon fill=\"none\" stroke=\"black\" points=\"705.5,-166 705.5,-187 718.5,-187 718.5,-166 705.5,-166\"/>\n",
4733       "<text text-anchor=\"start\" x=\"708.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4734       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"718.5,-166 718.5,-187 731.5,-187 731.5,-166 718.5,-166\"/>\n",
4735       "<polygon fill=\"none\" stroke=\"black\" points=\"718.5,-166 718.5,-187 731.5,-187 731.5,-166 718.5,-166\"/>\n",
4736       "<text text-anchor=\"start\" x=\"721.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">3</text>\n",
4737       "<polygon fill=\"none\" stroke=\"black\" points=\"731.5,-166 731.5,-187 752.5,-187 752.5,-166 731.5,-166\"/>\n",
4738       "<text text-anchor=\"start\" x=\"735\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">#2</text>\n",
4739       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"752.5,-166 752.5,-187 765.5,-187 765.5,-166 752.5,-166\"/>\n",
4740       "<polygon fill=\"none\" stroke=\"black\" points=\"752.5,-166 752.5,-187 765.5,-187 765.5,-166 752.5,-166\"/>\n",
4741       "<text text-anchor=\"start\" x=\"755.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4742       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"765.5,-166 765.5,-187 778.5,-187 778.5,-166 765.5,-166\"/>\n",
4743       "<polygon fill=\"none\" stroke=\"black\" points=\"765.5,-166 765.5,-187 778.5,-187 778.5,-166 765.5,-166\"/>\n",
4744       "<text text-anchor=\"start\" x=\"768.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
4745       "<polygon fill=\"none\" stroke=\"black\" points=\"778.5,-166 778.5,-187 799.5,-187 799.5,-166 778.5,-166\"/>\n",
4746       "<text text-anchor=\"start\" x=\"782\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">#3</text>\n",
4747       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"799.5,-166 799.5,-187 812.5,-187 812.5,-166 799.5,-166\"/>\n",
4748       "<polygon fill=\"none\" stroke=\"black\" points=\"799.5,-166 799.5,-187 812.5,-187 812.5,-166 799.5,-166\"/>\n",
4749       "<text text-anchor=\"start\" x=\"802.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
4750       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"812.5,-166 812.5,-187 825.5,-187 825.5,-166 812.5,-166\"/>\n",
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4764       "</g>\n",
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4766       "<g id=\"node4\" class=\"node\">\n",
4767       "<title>meta</title>\n",
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4771       "<text text-anchor=\"start\" x=\"10.5\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">num_sets:</text>\n",
4772       "<text text-anchor=\"start\" x=\"78.5\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">2</text>\n",
4773       "<text text-anchor=\"start\" x=\"10.5\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">acceptance:</text>\n",
4774       "<text text-anchor=\"start\" x=\"78.5\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">Fin(0) &amp; Inf(1)</text>\n",
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5210       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"525.5,-124 525.5,-145 545.5,-145 545.5,-124 525.5,-124\"/>\n",
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5214       "<polygon fill=\"none\" stroke=\"black\" points=\"545.5,-124 545.5,-145 572.5,-145 572.5,-124 545.5,-124\"/>\n",
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5219       "</g>\n",
5220       "<!-- dests -->\n",
5221       "<g id=\"node3\" class=\"node\">\n",
5222       "<title>dests</title>\n",
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5224       "<polyline fill=\"none\" stroke=\"black\" points=\"634.5,-187 683.5,-187 \"/>\n",
5225       "<text text-anchor=\"start\" x=\"645\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">dests</text>\n",
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5227       "<polyline fill=\"none\" stroke=\"black\" points=\"683.5,-187 704.5,-187 \"/>\n",
5228       "<text text-anchor=\"start\" x=\"686.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">~0</text>\n",
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5235       "<polyline fill=\"none\" stroke=\"black\" points=\"764.5,-187 777.5,-187 \"/>\n",
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5237       "<polyline fill=\"none\" stroke=\"black\" points=\"777.5,-187 798.5,-187 \"/>\n",
5238       "<text text-anchor=\"start\" x=\"780.5\" y=\"-193.8\" font-family=\"Times,serif\" font-size=\"14.00\">~6</text>\n",
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5240       "<polyline fill=\"none\" stroke=\"black\" points=\"811.5,-187 824.5,-187 \"/>\n",
5241       "<polyline fill=\"none\" stroke=\"black\" points=\"824.5,-187 837.5,-187 \"/>\n",
5242       "<polygon fill=\"none\" stroke=\"black\" points=\"634.5,-166 634.5,-187 683.5,-187 683.5,-166 634.5,-166\"/>\n",
5243       "<text text-anchor=\"start\" x=\"637.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">#cnt/dst</text>\n",
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5245       "<text text-anchor=\"start\" x=\"687\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">#2</text>\n",
5246       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"704.5,-166 704.5,-187 717.5,-187 717.5,-166 704.5,-166\"/>\n",
5247       "<polygon fill=\"none\" stroke=\"black\" points=\"704.5,-166 704.5,-187 717.5,-187 717.5,-166 704.5,-166\"/>\n",
5248       "<text text-anchor=\"start\" x=\"707.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
5249       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"717.5,-166 717.5,-187 730.5,-187 730.5,-166 717.5,-166\"/>\n",
5250       "<polygon fill=\"none\" stroke=\"black\" points=\"717.5,-166 717.5,-187 730.5,-187 730.5,-166 717.5,-166\"/>\n",
5251       "<text text-anchor=\"start\" x=\"720.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">3</text>\n",
5252       "<polygon fill=\"none\" stroke=\"black\" points=\"730.5,-166 730.5,-187 751.5,-187 751.5,-166 730.5,-166\"/>\n",
5253       "<text text-anchor=\"start\" x=\"734\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">#2</text>\n",
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5255       "<polygon fill=\"none\" stroke=\"black\" points=\"751.5,-166 751.5,-187 764.5,-187 764.5,-166 751.5,-166\"/>\n",
5256       "<text text-anchor=\"start\" x=\"754.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
5257       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"764.5,-166 764.5,-187 777.5,-187 777.5,-166 764.5,-166\"/>\n",
5258       "<polygon fill=\"none\" stroke=\"black\" points=\"764.5,-166 764.5,-187 777.5,-187 777.5,-166 764.5,-166\"/>\n",
5259       "<text text-anchor=\"start\" x=\"767.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
5260       "<polygon fill=\"none\" stroke=\"black\" points=\"777.5,-166 777.5,-187 798.5,-187 798.5,-166 777.5,-166\"/>\n",
5261       "<text text-anchor=\"start\" x=\"781\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">#3</text>\n",
5262       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"798.5,-166 798.5,-187 811.5,-187 811.5,-166 798.5,-166\"/>\n",
5263       "<polygon fill=\"none\" stroke=\"black\" points=\"798.5,-166 798.5,-187 811.5,-187 811.5,-166 798.5,-166\"/>\n",
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5266       "<polygon fill=\"none\" stroke=\"black\" points=\"811.5,-166 811.5,-187 824.5,-187 824.5,-166 811.5,-166\"/>\n",
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5268       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"824.5,-166 824.5,-187 837.5,-187 837.5,-166 824.5,-166\"/>\n",
5269       "<polygon fill=\"none\" stroke=\"black\" points=\"824.5,-166 824.5,-187 837.5,-187 837.5,-166 824.5,-166\"/>\n",
5270       "<text text-anchor=\"start\" x=\"827.5\" y=\"-172.8\" font-family=\"Times,serif\" font-size=\"14.00\">2</text>\n",
5271       "</g>\n",
5272       "<!-- meta -->\n",
5273       "<g id=\"node4\" class=\"node\">\n",
5274       "<title>meta</title>\n",
5275       "<text text-anchor=\"start\" x=\"10.5\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">init_state:</text>\n",
5276       "<polygon fill=\"pink\" stroke=\"transparent\" points=\"76.5,-61 76.5,-80 165.5,-80 165.5,-61 76.5,-61\"/>\n",
5277       "<text text-anchor=\"start\" x=\"78.5\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">~6</text>\n",
5278       "<text text-anchor=\"start\" x=\"10.5\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">num_sets:</text>\n",
5279       "<text text-anchor=\"start\" x=\"78.5\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">2</text>\n",
5280       "<text text-anchor=\"start\" x=\"10.5\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">acceptance:</text>\n",
5281       "<text text-anchor=\"start\" x=\"78.5\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">Fin(0) &amp; Inf(1)</text>\n",
5282       "<text text-anchor=\"start\" x=\"10.5\" y=\"-9.8\" font-family=\"Times,serif\" font-size=\"14.00\">ap_vars:</text>\n",
5283       "<text text-anchor=\"start\" x=\"78.5\" y=\"-9.8\" font-family=\"Times,serif\" font-size=\"14.00\">b a</text>\n",
5284       "</g>\n",
5285       "<!-- meta&#45;&gt;states -->\n",
5286       "</g>\n",
5287       "</svg>\n"
5288      ],
5289      "text/plain": [
5290       "<spot.jupyter.SVG object>"
5291      ]
5292     },
5293     "metadata": {},
5294     "output_type": "display_data"
5295    }
5296   ],
5297   "source": [
5298    "aut.new_univ_edge(3, [0,3], buddy.bddtrue, [0])\n",
5299    "display(aut, aut.show_storage(\"vd\"))\n",
5300    "aut.merge_edges()\n",
5301    "display(aut, aut.show_storage(\"vd\"))"
5302   ]
5303  },
5304  {
5305   "cell_type": "markdown",
5306   "metadata": {},
5307   "source": [
5308    "Above group `~0` and `~10` have been merged."
5309   ]
5310  },
5311  {
5312   "cell_type": "markdown",
5313   "metadata": {},
5314   "source": [
5315    "# Named properties\n",
5316    "\n",
5317    "Finally automata can also been attached [arbitrarily named properties](https://spot.lrde.epita.fr/concepts.html#named-properties).  The `show_storage()` method will only display the name of these properties, not their contents.  Properties like `automaton-name` are used to store a name for the automaton, `product-states` is filled by `product()` and holds a vector of pairs representing the source states in the product's operands, etc."
5318   ]
5319  },
5320  {
5321   "cell_type": "code",
5322   "execution_count": 32,
5323   "metadata": {},
5324   "outputs": [
5325    {
5326     "data": {
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5340       "<text text-anchor=\"start\" x=\"88.5\" y=\"-142.3\" font-family=\"Lato\" font-size=\"14.00\">Inf(</text>\n",
5341       "<text text-anchor=\"start\" x=\"110.5\" y=\"-142.3\" font-family=\"Lato\" font-size=\"14.00\" fill=\"#1f78b4\">⓿</text>\n",
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5343       "<text text-anchor=\"start\" x=\"86.5\" y=\"-128.3\" font-family=\"Lato\" font-size=\"14.00\">[Büchi]</text>\n",
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5359       "<title>0&#45;&gt;0</title>\n",
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5386       "<title>1&#45;&gt;1</title>\n",
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5390       "</g>\n",
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5393       "<title>1&#45;&gt;1</title>\n",
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5399       "</g>\n",
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5401      ],
5402      "text/plain": [
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5542       "<text text-anchor=\"start\" x=\"411.5\" y=\"-244.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
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5544       "<polygon fill=\"none\" stroke=\"black\" points=\"425,-238 425,-259 452,-259 452,-238 425,-238\"/>\n",
5545       "<text text-anchor=\"start\" x=\"435\" y=\"-244.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
5546       "</g>\n",
5547       "<!-- meta -->\n",
5548       "<g id=\"node3\" class=\"node\">\n",
5549       "<title>meta</title>\n",
5550       "<text text-anchor=\"start\" x=\"10\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">init_state:</text>\n",
5551       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"76,-118 76,-137 112,-137 112,-118 76,-118\"/>\n",
5552       "<text text-anchor=\"start\" x=\"78\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
5553       "<text text-anchor=\"start\" x=\"10\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">num_sets:</text>\n",
5554       "<text text-anchor=\"start\" x=\"78\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
5555       "<text text-anchor=\"start\" x=\"10\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">acceptance:</text>\n",
5556       "<text text-anchor=\"start\" x=\"78\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">Inf(0)</text>\n",
5557       "<text text-anchor=\"start\" x=\"10\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">ap_vars:</text>\n",
5558       "<text text-anchor=\"start\" x=\"78\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">b a</text>\n",
5559       "</g>\n",
5560       "<!-- meta&#45;&gt;states -->\n",
5561       "<!-- props -->\n",
5562       "<g id=\"node4\" class=\"node\">\n",
5563       "<title>props</title>\n",
5564       "<text text-anchor=\"start\" x=\"155\" y=\"-180.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_state_acc:</text>\n",
5565       "<text text-anchor=\"start\" x=\"299\" y=\"-180.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5566       "<text text-anchor=\"start\" x=\"155\" y=\"-161.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_inherently_weak:</text>\n",
5567       "<text text-anchor=\"start\" x=\"299\" y=\"-161.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5568       "<text text-anchor=\"start\" x=\"155\" y=\"-142.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_terminal:</text>\n",
5569       "<text text-anchor=\"start\" x=\"299\" y=\"-142.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5570       "<text text-anchor=\"start\" x=\"155\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_weak:</text>\n",
5571       "<text text-anchor=\"start\" x=\"299\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5572       "<text text-anchor=\"start\" x=\"155\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_very_weak:</text>\n",
5573       "<text text-anchor=\"start\" x=\"299\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5574       "<text text-anchor=\"start\" x=\"155\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_complete:</text>\n",
5575       "<text text-anchor=\"start\" x=\"299\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5576       "<text text-anchor=\"start\" x=\"155\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_universal:</text>\n",
5577       "<text text-anchor=\"start\" x=\"299\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
5578       "<text text-anchor=\"start\" x=\"155\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_unambiguous:</text>\n",
5579       "<text text-anchor=\"start\" x=\"299\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
5580       "<text text-anchor=\"start\" x=\"155\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_semi_deterministic:</text>\n",
5581       "<text text-anchor=\"start\" x=\"299\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
5582       "<text text-anchor=\"start\" x=\"155\" y=\"-9.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_stutter_invariant:</text>\n",
5583       "<text text-anchor=\"start\" x=\"299\" y=\"-9.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
5584       "</g>\n",
5585       "<!-- props&#45;&gt;edges -->\n",
5586       "<!-- namedprops -->\n",
5587       "<g id=\"node5\" class=\"node\">\n",
5588       "<title>namedprops</title>\n",
5589       "<text text-anchor=\"middle\" x=\"421\" y=\"-110.3\" font-family=\"Times,serif\" font-size=\"14.00\">named properties:</text>\n",
5590       "<text text-anchor=\"middle\" x=\"421\" y=\"-95.3\" font-family=\"Times,serif\" font-size=\"14.00\">automaton&#45;name</text>\n",
5591       "<text text-anchor=\"middle\" x=\"421\" y=\"-80.3\" font-family=\"Times,serif\" font-size=\"14.00\">product&#45;states</text>\n",
5592       "</g>\n",
5593       "<!-- namedprops&#45;&gt;edges -->\n",
5594       "</g>\n",
5595       "</svg>\n"
5596      ],
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5598       "<spot.jupyter.SVG object>"
5599      ]
5600     },
5601     "metadata": {},
5602     "output_type": "display_data"
5603    }
5604   ],
5605   "source": [
5606    "aub = spot.translate('a U b')\n",
5607    "gfa = spot.translate('GFa')\n",
5608    "prod = spot.product(aub, gfa)\n",
5609    "prod.set_name(\"aub * gfa\")\n",
5610    "display(prod, prod.show_storage())"
5611   ]
5612  },
5613  {
5614   "cell_type": "markdown",
5615   "metadata": {},
5616   "source": [
5617    "These properties also need to be updated by algorithms.  They can be reset with:"
5618   ]
5619  },
5620  {
5621   "cell_type": "code",
5622   "execution_count": 33,
5623   "metadata": {},
5624   "outputs": [
5625    {
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5838       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"320,-238 320,-259 340,-259 340,-238 320,-238\"/>\n",
5839       "<polygon fill=\"none\" stroke=\"black\" points=\"320,-238 320,-259 340,-259 340,-238 320,-238\"/>\n",
5840       "<text text-anchor=\"start\" x=\"326.5\" y=\"-244.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
5841       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"340,-238 340,-259 367,-259 367,-238 340,-238\"/>\n",
5842       "<polygon fill=\"none\" stroke=\"black\" points=\"340,-238 340,-259 367,-259 367,-238 340,-238\"/>\n",
5843       "<text text-anchor=\"start\" x=\"350\" y=\"-244.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
5844       "</g>\n",
5845       "<!-- meta -->\n",
5846       "<g id=\"node3\" class=\"node\">\n",
5847       "<title>meta</title>\n",
5848       "<text text-anchor=\"start\" x=\"10\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">init_state:</text>\n",
5849       "<polygon fill=\"yellow\" stroke=\"transparent\" points=\"76,-118 76,-137 112,-137 112,-118 76,-118\"/>\n",
5850       "<text text-anchor=\"start\" x=\"78\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">0</text>\n",
5851       "<text text-anchor=\"start\" x=\"10\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">num_sets:</text>\n",
5852       "<text text-anchor=\"start\" x=\"78\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">1</text>\n",
5853       "<text text-anchor=\"start\" x=\"10\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">acceptance:</text>\n",
5854       "<text text-anchor=\"start\" x=\"78\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">Inf(0)</text>\n",
5855       "<text text-anchor=\"start\" x=\"10\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">ap_vars:</text>\n",
5856       "<text text-anchor=\"start\" x=\"78\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">b a</text>\n",
5857       "</g>\n",
5858       "<!-- meta&#45;&gt;states -->\n",
5859       "<!-- props -->\n",
5860       "<g id=\"node4\" class=\"node\">\n",
5861       "<title>props</title>\n",
5862       "<text text-anchor=\"start\" x=\"161\" y=\"-180.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_state_acc:</text>\n",
5863       "<text text-anchor=\"start\" x=\"305\" y=\"-180.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5864       "<text text-anchor=\"start\" x=\"161\" y=\"-161.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_inherently_weak:</text>\n",
5865       "<text text-anchor=\"start\" x=\"305\" y=\"-161.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5866       "<text text-anchor=\"start\" x=\"161\" y=\"-142.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_terminal:</text>\n",
5867       "<text text-anchor=\"start\" x=\"305\" y=\"-142.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5868       "<text text-anchor=\"start\" x=\"161\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_weak:</text>\n",
5869       "<text text-anchor=\"start\" x=\"305\" y=\"-123.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5870       "<text text-anchor=\"start\" x=\"161\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_very_weak:</text>\n",
5871       "<text text-anchor=\"start\" x=\"305\" y=\"-104.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5872       "<text text-anchor=\"start\" x=\"161\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_complete:</text>\n",
5873       "<text text-anchor=\"start\" x=\"305\" y=\"-85.8\" font-family=\"Times,serif\" font-size=\"14.00\">maybe</text>\n",
5874       "<text text-anchor=\"start\" x=\"161\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_universal:</text>\n",
5875       "<text text-anchor=\"start\" x=\"305\" y=\"-66.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
5876       "<text text-anchor=\"start\" x=\"161\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_unambiguous:</text>\n",
5877       "<text text-anchor=\"start\" x=\"305\" y=\"-47.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
5878       "<text text-anchor=\"start\" x=\"161\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_semi_deterministic:</text>\n",
5879       "<text text-anchor=\"start\" x=\"305\" y=\"-28.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
5880       "<text text-anchor=\"start\" x=\"161\" y=\"-9.8\" font-family=\"Times,serif\" font-size=\"14.00\">prop_stutter_invariant:</text>\n",
5881       "<text text-anchor=\"start\" x=\"305\" y=\"-9.8\" font-family=\"Times,serif\" font-size=\"14.00\">yes</text>\n",
5882       "</g>\n",
5883       "<!-- props&#45;&gt;edges -->\n",
5884       "</g>\n",
5885       "</svg>\n"
5886      ],
5887      "text/plain": [
5888       "<spot.jupyter.SVG object>"
5889      ]
5890     },
5891     "metadata": {},
5892     "output_type": "display_data"
5893    }
5894   ],
5895   "source": [
5896    "prod.release_named_properties()\n",
5897    "display(prod, prod.show_storage())"
5898   ]
5899  }
5900 ],
5901 "metadata": {
5902  "kernelspec": {
5903   "display_name": "Python 3",
5904   "language": "python",
5905   "name": "python3"
5906  },
5907  "language_info": {
5908   "codemirror_mode": {
5909    "name": "ipython",
5910    "version": 3
5911   },
5912   "file_extension": ".py",
5913   "mimetype": "text/x-python",
5914   "name": "python",
5915   "nbconvert_exporter": "python",
5916   "pygments_lexer": "ipython3",
5917   "version": "3.7.5"
5918  }
5919 },
5920 "nbformat": 4,
5921 "nbformat_minor": 2
5922}
5923