fact: Definition PO_rec (P: Type) (l': B -> P) (r': C -> P) (pp': l' o f == r' o g) : PO f g -> P := Colimit_rec P (Build_span_cocone l' r' pp').
imports: Basics Types Diagrams.Graph Diagrams.Diagram Diagrams.Span Diagrams.Cocone Colimits.Colimit