fact: Definition make_empty_diagram {C : category} : diagram empty_graph C := make_diagram (fromempty : vertex empty_graph -> C) (λ _ _, fromempty).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Limits.Graphs.Colimits UniMath.Combinatorics.StandardFiniteSets UniMath.Combinatorics.FiniteSets