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