fact: Definition z_iso_after_z_iso_inv {C : precategory_data} {a b : ob C} (f : z_iso a b) : inv_from_z_iso f · f = identity _ := pr2 (pr2 (pr2 f)).
imports: UniMath.Foundations.PartA UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories