fact: Definition setcategory_eq_idtoiso_comp {C : setcategory} {x x' y y' : C} (p p' : x = x') (f : x' --> y) (q q' : y = y') : idtoiso p · f · idtoiso q = idtoiso p' · f · idtoiso q'.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors