proposition: Lemma underlyingIso_incl {G:gr} {X Y:Action G} : isincl (underlyingIso : ActionIso X Y -> X ≃ Y).
proof: Proof. intros. apply isinclpr1; intro f. apply propproperty. Defined.
imports: UniMath.Foundations.All UniMath.MoreFoundations.Propositions UniMath.MoreFoundations.Notations UniMath.MoreFoundations.Univalence UniMath.MoreFoundations.Tactics UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Combinatorics.OrderedSets