proposition: Lemma ActionIso_isaset {G:gr} (X Y:Action G) : isaset (ActionIso X Y).
proof: Proof. apply (isofhlevelsninclb _ pr1). { apply isinclpr1; intro f. apply propproperty. } apply isofhlevelsnweqtohlevelsn. apply setproperty. 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