proposition: Lemma ltf_nV2 : {in neg &, {mono (@GRing.inv F) : x y /~ x < y}}.
proof: Proof. exact: leW_nmono_in lef_nV2. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)