idtoiso_comp4' (C : PreCategory) (s d d' d'' d''' : C) (m0 : d'' = d''') (m1 : d' = d'') (m2 : d = d') (m3 : s = d) : ((idtoiso _ m0 o idtoiso _ m1) o idtoiso _ m2) o idtoiso _ m3 = idtoiso _ (m3 @ (m2 @ (m1 @ m0)))%path. Proof. idtoiso_t. Qed.
Require Import Category.Core Functor.Core. Require Import HoTT.Tactics Basics.Trunc Basics.Tactics Types.Sigma Equivalences.