fact: Definition component_e' (e : edge G) : edge (union G1 G2) := match decE e with inl p => inl (Sub e p) | inr p => inr (Sub e p) end.
imports: Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient bij preliminaries) GraphTheory(digraph sgraph treewidth minor checkpoint) GraphTheory(setoid_bigop structures mgraph mgraph2)