proposition: Lemma leEsub x y : (x <= y) = (val x <= val y).
proof: Proof. by rewrite omorph_le. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)