Lemma iscotransapSet {X : apSet} : ∏ x y z : X, x # z → x # y ∨ y # z. Proof. exact (pr2 (pr2 (pr2 (pr2 X)))). Qed.
Require Import UniMath.Foundations.Propositions. Require Import UniMath.MoreFoundations.Sets. Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions.