Definition binarySumProperty {C:category} {a b c:C} (f:a-->c) (g:b-->c) := isUniversal ((f ,, g) : HomPair (opp_ob a) (opp_ob b) ◾ c : hSet).
Require Import UniMath.Foundations.Preamble. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import Require Import Require Import UniMath.MoreFoundations.Tactics.