proposition: Lemma ltzN_nat m n : (m%:Z < - n%:Z) = false.
proof: Proof. by move: m n=> [|?] []. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(fintype finfun bigop order ssralg countalg ssrnum) mathcomp(poly)