-- -*- M2-comint -*- hash: 710641381628020812

i1 : C1 = coneFromVData matrix {{1,0},{0,1}};

i2 : C2 = coneFromVData matrix {{1,-1},{0,-1}};

i3 : C3 = coneFromVData matrix {{1,-1},{2,-1}};

i4 : commonFace(C1,C2)

o4 = true

i5 : commonFace(C2,C3)

o5 = true

i6 : commonFace(C3,C1)

o6 = false

i7 : 
