proposition: Lemma lteNr x y : (x < - y) = (y < - x).
proof: Proof. by move: x y => [r| |] [r'| |] //=; rewrite ?(ltry, ltNyr)// !lte_fin ltrNr. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra) signed