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