fact: Definition isapunop {X : tightapSet} (op :unop X) := ∏ x y : X, op x ≠ op y -> x ≠ y.
imports: UniMath.Algebra.BinaryOperations UniMath.Foundations.Propositions UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions