-- -*- M2-comint -*- {* hash: -1871256347 *}

i1 : F = hirzebruch 3

o1 = {ambient dimension => 2         }
      number of generating cones => 4
      number of rays => 4
      top dimension of the cones => 2

o1 : Fan

i2 : dim F

o2 = 2

i3 :