(C : PreCategory) (s d : C) (p : s = d) : (idtoiso _ p)^-1 = idtoiso _ (p^)%path. Proof. path_induction; reflexivity. Defined.
Require Import Category.Core Functor.Core. Require Import HoTT.Tactics Basics.Trunc Basics.Tactics Types.Sigma Equivalences.