fact: Definition iscolimit_precompose_equiv {D1 D2 : Diagram G} (m : D1 ~d~ D2) {Q : Type} : IsColimit D2 Q -> IsColimit D1 Q.
imports: Basics Types Diagrams.Diagram Diagrams.Graph Diagrams.Cocone Diagrams.ConstantDiagram Colimits.Coeq