1##
2## Some corner cases for a polyhedron that is defined by generators.
3##
4gap> C := Cdd_PolyhedronByGenerators( [ [ 0, 2 ], [ 0, -2 ] ] );;
5gap> Display( Cdd_H_Rep( C ) );
6H-representation
7begin
8   1 X 2  rational
9
10   1  0
11end
12gap> C := Cdd_PolyhedronByGenerators( [ [ 1, 2 ], [ 1, -2 ] ] );;
13gap> Display( Cdd_H_Rep( C ) );
14H-representation
15begin
16   2 X 2  rational
17
18   2  -1
19   2   1
20end
21gap> C := Cdd_PolyhedronByGenerators( [ [ 1, 0 ] ] );;
22gap> Display( Cdd_H_Rep( C ) );
23H-representation
24linearity 1, [ 2 ]
25begin
26   2 X 2  rational
27
28   1  0
29   0  1
30end
31gap> C := Cdd_PolyhedronByInequalities( [ [ -2 , 1 ], [ 1, -1 ] ] );;
32gap> Display( Cdd_V_Rep( C ) );
33The empty polyhedron
34