-- -*- M2-comint -*- {* hash: -232630920 *} i1 : convexHull matrix {{1,1,0,0},{1,0,1,0}} o1 = {ambient dimension => 2 } dimension of lineality space => 0 dimension of polyhedron => 2 number of facets => 4 number of rays => 0 number of vertices => 4 o1 : Polyhedron i2 : posHull matrix {{1,2},{2,1}} o2 = {ambient dimension => 2 } dimension of lineality space => 0 dimension of the cone => 2 number of facets => 2 number of rays => 2 o2 : Cone i3 : hirzebruch 3 o3 = {ambient dimension => 2 } number of generating cones => 4 number of rays => 4 top dimension of the cones => 2 o3 : Fan i4 :