-- -*- M2-comint -*- {* hash: 238106564 *}

i1 : P = intersection(matrix{{1,-1},{0,-1},{-1,-1},{0,1}}, matrix{{0},{-1},{0},{1}})

o1 = {ambient dimension => 2           }
      dimension of lineality space => 0
      dimension of polyhedron => 1
      number of facets => 2
      number of rays => 0
      number of vertices => 2

o1 : Polyhedron

i2 : vertices P

o2 = | -1 1 |
     | 1  1 |

              2        2
o2 : Matrix QQ  <--- QQ

i3 :