fact: Hypotheses (fgu:fgraph u) (du: domain u = I) (function_u: forall i, inc i I -> function_prop (Vg u i) (Vg E i) F) (compose_u: forall i j, gle r i j -> (Vg u j) \co Vg f (J i j) = Vg u i).
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat)