fact: Definition opp_arrow {C : category} (g : arrow C) : arrow (op_cat C) := (make_dirprod (arrow_cod g) (arrow_dom g),, arrow_mor g).
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.PrecategoryBinProduct UniMath.CategoryTheory.opp_precat UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.DisplayedCats.SIP UniMath.CategoryTheory.DisplayedCats.Total UniMath.CategoryTheory.Limits.Graphs.Colimits