fact: Definition reverse_zig_zag_of_length {C : category} {n : ℕ} {x y : C} (gs : zig_zag_of_length n x y) : zig_zag_of_length n y x.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Groupoids