fact: Definition castL (x' x y : G) (E : x = x') (p : Path x y) : Path x' y := match E in (_ = y0) return (Path y0 y) with erefl => p end.
imports: HB(structures) Coq(Setoid CMorphisms) mathcomp(all_ssreflect) GraphTheory(edone preliminaries bij)