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