proposition: Lemma nonzero1_alg : one_alg != zero_alg.
proof: Proof. by rewrite piE -(rwP neq_algcrealP) (rwP neq_creal_cst) oner_eq0. 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)