proposition: Lemma leNgt x y : (x <= y) = ~~ (y < x).
proof: Proof. exact: comparable_leNgt. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)