{A B : Type} (f : A -> B) `{In O B} : to O B o O_rec f == O_functor f := O_rec_postcompose f (to O B).
Require Import HoTT.Basics HoTT.Types. Require Import Equiv.BiInv Extensions HProp HFiber NullHomotopy Limits.Pullback. Require Import Homotopy.IdentitySystems. Require Import Colimits.Pushout.