-- -*- M2-comint -*- {* hash: 1054725421 *}

i1 : C = posHull matrix {{1,-1},{0,-1}}

o1 = {ambient dimension => 2           }
      dimension of lineality space => 0
      dimension of the cone => 2
      number of facets => 2
      number of rays => 2

o1 : Cone

i2 : F = fan C

o2 = {ambient dimension => 2         }
      number of generating cones => 1
      number of rays => 2
      top dimension of the cones => 2

o2 : Fan

i3 : C1 = posHull matrix {{1,0},{0,1}};

i4 : C2 = posHull matrix {{0,-1},{1,-1}};

i5 : F = fan {C,C1,C2}

o5 = {ambient dimension => 2         }
      number of generating cones => 3
      number of rays => 3
      top dimension of the cones => 2

o5 : Fan

i6 :