fact: Definition component_v' (z : G) : union G1 G2 := match decC z with inl p => inl (Sub z p) | inr p => inr (Sub z 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)