GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
3 vertices of polyhedron 4 extreme rays of recession cone 7 support hyperplanes of polyhedron (homogenized) embedding dimension = 4 affine dimension of the polyhedron = 3 (maximal) rank of recession monoid = 3 internal index = 2 dehomogenization: 0 0 0 1 grading: 0 0 1 0 *********************************************************************** 3 vertices of polyhedron: 0 1 0 2 1 0 0 2 1 1 0 2 4 extreme rays of recession cone: 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 0 7 support hyperplanes of polyhedron (homogenized): -2 0 2 1 0 -2 2 1 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0 2 2 0 -1