proposition: Lemma leR_maxl : x <= max x y.
proof: Proof. by case: (max x y) / IFR_cases => _ [][ltxm ->]//; apply/ltRW. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div order) mathcomp(ssralg ssrnum ssrint rat intdiv) Coq(Morphisms Setoid) fourcolor(real realsyntax)