fact: Definition open_add_test (x : G) a : open (G[tst x <- a]) ⩭2 (open G)[adt inj_v x <- a].
imports: Coq(Relation_Definitions Morphisms RelationClasses) mathcomp(all_ssreflect) GraphTheory(edone finite_quotient preliminaries bij equiv) GraphTheory(setoid_bigop structures pttdom mgraph mgraph2) GraphTheory(rewriting open_confluence finmap_plus)