Lemma is_torsor_isaprop {G:gr} (X:Action G) : isaprop (is_torsor X). Proof. intros. apply isapropdirprod. { apply propproperty. } { apply impred; intro x. apply isapropisweq. } Qed.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.Propositions. Require Import UniMath.MoreFoundations.Notations. Require Import UniMath.MoreFoundations.Univalence. Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.Monoids. Require Import UniMath.Algebra.Groups. Require Import UniMath.OrderTheory.OrderedSets.OrderedSets. Import UniMath.MoreFoundations.PartA.