proposition: Lemma eqCmodMr0 e : {in Num.int, forall x, e * x == 0 %[mod e]}%C.
proof: Proof. by move=> x Zx; rewrite /= mulrC eqCmodMl0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun ssrnat eqtype seq choice) mathcomp(div fintype path bigop finset prime order ssralg) mathcomp(poly polydiv mxpoly generic_quotient countalg) mathcomp(ssrnum closed_field ssrint archimedean rat intdiv) mathcomp(algebraics_fundamentals)