`(@IsIsomorphism C y z p) `(@IsIsomorphism C x y q) : (p o q)^-1 = q^-1 o p^-1. Proof. iso_concat_t. Qed.
Require Import Category.Core Functor.Core. Require Import HoTT.Tactics Basics.Trunc Basics.Tactics Types.Sigma Equivalences.