proposition: Lemma add_0alg : left_id zero_alg add_alg.
proof: Proof. by elim/quotW=> x; rewrite !piE -equiv_alg /= add_0creal. 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)