fact: Definition diagram_op {C : category} {g : graph} (d : diagram g C) : diagram (graph_op g) (opp_cat C).
imports: UniMath.Foundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.OppositeCategory.Core UniMath.CategoryTheory.Limits.Cones UniMath.CategoryTheory.Limits.Graphs.Colimits UniMath.CategoryTheory.Limits.Graphs.Limits UniMath.CategoryTheory.Chains.Chains UniMath.CategoryTheory.Chains.Cochains