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