1<h1>Results</h1>
2
3As in step-16, the solution looks like this on the finest mesh:
4
5<p align="center">
6  <img src="https://www.dealii.org/images/steps/developer/step-16.solution.png" alt="">
7</p>
8
9The output is formatted in a slightly different way compared to step-16 but is
10functionally the same and shows the same convergence properties:
11<pre>
12DEAL::Cycle 0
13DEAL::   Number of active cells:       20
14DEAL::   Number of degrees of freedom: 25 (by level: 8, 25)
15DEAL:cg::Starting value 0.510691
16DEAL:cg::Convergence step 6 value 4.59193e-14
17DEAL::Cycle 1
18DEAL::   Number of active cells:       44
19DEAL::   Number of degrees of freedom: 55 (by level: 8, 25, 45)
20DEAL:cg::Starting value 0.440678
21DEAL:cg::Convergence step 8 value 1.99419e-13
22DEAL::Cycle 2
23DEAL::   Number of active cells:       86
24DEAL::   Number of degrees of freedom: 105 (by level: 8, 25, 69, 49)
25DEAL:cg::Starting value 0.371855
26DEAL:cg::Convergence step 9 value 1.13984e-13
27DEAL::Cycle 3
28DEAL::   Number of active cells:       170
29DEAL::   Number of degrees of freedom: 200 (by level: 8, 25, 77, 174)
30DEAL:cg::Starting value 0.318967
31DEAL:cg::Convergence step 9 value 2.62112e-13
32DEAL::Cycle 4
33DEAL::   Number of active cells:       332
34DEAL::   Number of degrees of freedom: 388 (by level: 8, 25, 86, 231, 204)
35DEAL:cg::Starting value 0.276534
36DEAL:cg::Convergence step 10 value 1.69562e-13
37DEAL::Cycle 5
38DEAL::   Number of active cells:       632
39DEAL::   Number of degrees of freedom: 714 (by level: 8, 25, 89, 231, 514, 141)
40DEAL:cg::Starting value 0.215300
41DEAL:cg::Convergence step 10 value 6.47463e-13
42DEAL::Cycle 6
43DEAL::   Number of active cells:       1202
44DEAL::   Number of degrees of freedom: 1332 (by level: 8, 25, 89, 282, 771, 435, 257)
45DEAL:cg::Starting value 0.175848
46DEAL:cg::Convergence step 10 value 1.80664e-13
47DEAL::Cycle 7
48DEAL::   Number of active cells:       2288
49DEAL::   Number of degrees of freedom: 2511 (by level: 8, 25, 89, 318, 779, 1420, 829, 30)
50DEAL:cg::Starting value 0.136724
51DEAL:cg::Convergence step 11 value 9.73331e-14
52</pre>
53