Lemma isinvmulthrelnatgth : @isinvbinophrel natmultabmonoid natgth. Proof. split. - intros a b c r. apply (natlthandmultlinv _ _ _ r). - intros a b c r. apply (natlthandmultrinv _ _ _ r). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.NegativePropositions.