vertices returns the vertices of the Polyhedron or PolyhedralComplex P as the columns of the Matrix V.
Please see V- and H-representation on the conventions we use for cones and polyhedra.
i1 : P = polyhedronFromHData(matrix{{1,-1},{0,-1},{-1,-1},{0,1}}, matrix{{0},{-1},{0},{1}})
o1 = P
o1 : Polyhedron