proposition: Lemma leb_Zneg0N x : ~ (0 <= Zneg x)%Z.
proof: Proof. exact/Z.lt_nge/ltb_Zneg0. Qed.
imports: ZArith Zwf Lia mathcomp(ssreflect eqtype ssrbool ssrnat div fintype seq ssrfun order) mathcomp(bigop fingroup choice ssralg ssrnum rat poly) pol