fact: Definition bij_setD (aT : finType) (C : choiceType) (rT : {fset C}) (A : {set aT}) (f : bij aT rT) : bij { x | x \in ~: A} (rT `\` [fset val (f x) | x in A]).
imports: mathcomp(all_ssreflect) Coq(Relations.Relation_Definitions) GraphTheory(edone preliminaries) GraphTheory(bij)