proposition: Lemma iso_comp_left_isweq {C:category} {a b:ob C} (h:iso a b) (c:C) : isweq (λ f : hom _ c a, f · h).
proof: Proof. intros. apply (@iso_comp_right_isweq C^op b a (opp_iso h)). Qed.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.opp_precat UniMath.CategoryTheory.Categories.HSET.Core UniMath.CategoryTheory.Categories.HSET.MonoEpiIso UniMath.CategoryTheory.whiskering