proposition: Lemma quotient_uniqueness {G} {X:Torsor G} (y x:X) (g:G) : g*x = y -> g = y/x.
proof: Proof. intros e. exact (maponpaths pr1 (uniqueness (is_quotient _ y x) (g,,e))). 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