proposition: Lemma lt_alg0N (x : alg) : lt_alg 0 (- x) = lt_alg x 0.
proof: Proof. by rewrite -sub0r sub_alg_gt0. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop order ssralg ssrnum ssrint rat poly polydiv polyorder) mathcomp(perm matrix mxpoly polyXY binomial generic_quotient) mathcomp(cauchyreals separable zmodp bigenough)