proposition: Theorem mult_mono alpha beta gamma : nf alpha -> alpha <> zero -> beta t1< gamma -> alpha * beta t1< alpha * gamma.
proof: Proof. intros. destruct (@L14 alpha H gamma ); eauto with T1. Qed.
imports: Coq(Arith Max Bool Lia Compare_dec Relations Ensembles Wellfounded Bool RelationClasses Operators_Properties ArithRing Logic.Eqdep_dec) hydras(More_Arith Restriction DecPreOrder) hydras(OrdNotations)