proposition: Lemma lt_asym x y : x < y < x = false.
proof: Proof. by apply/negP => /andP []; apply: lt_nsym. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)