fact: Definition unitary {C : category} (dag : dagger_structure C) (x y : C) : UU := ∑ f : C⟦x,y⟧, is_unitary dag f.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.DaggerCategories.Categories