Definition isapunop {X : tightapSet} (op :unop X) := ∏ x y : X, op x ≠ op y → x ≠ y.
Require Import UniMath.Foundations.Propositions. Require Import UniMath.MoreFoundations.Sets. Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions.