b = isGraph H
i1 : QQ[a,b,c,d];
i2 : isGraph(hyperGraph {a*b,b*c,c*d}) o2 = true
i3 : isGraph(hyperGraph {a*b,b*c*d}) o3 = false
i4 : isGraph(hyperGraph {a*b,b*c,d}) o4 = false
The object isGraph is a method function.