proposition: Lemma bound_ltxx c1 c2 x : (BSide c1 x < BSide c2 x) = (c1 && ~~ c2).
proof: Proof. by rewrite /<%O /= lteifxx. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(div fintype bigop order ssralg finset fingroup) mathcomp(ssrnum)