proposition: Lemma isaprop_is_unitary {C : category} (dag : dagger_structure C) {x y : C} (f : C⟦x,y⟧) : isaprop (is_unitary dag f).
proof: Proof. apply isaprop_is_inverse_in_precat. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.DaggerCategories.Categories