proposition: Lemma ltBNle n (p q: BITS n) : ltB p q = ~~ leB q p.
proof: Proof. rewrite ltB_nat leB_nat. by rewrite ltnNge. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq fintype tuple zmodp div) ssrextra.tuple ssrextra.nat spec spec.properties operations mathcomp(ssralg)