{D1 D2 : Diagram G} (m : DiagramMap D1 D2) {Q1 Q2} (HQ1 : IsColimit D1 Q1) (HQ2: IsColimit D2 Q2) : cocone_precompose m HQ2 = cocone_postcompose HQ1 (functor_colimit m HQ1 HQ2) := (eisretr (cocone_postcompose HQ1) _)^.
Require Import Basics Types. Require Import Diagrams.Diagram. Require Import Diagrams.Graph. Require Import Diagrams.Cocone. Require Import Diagrams.ConstantDiagram. Require Import Colimits.Coeq.