proposition: Lemma exp2k_creal_eq0 : (exp2k_creal == 0)%CR.
proof: Proof. apply: eq_crealP; exists_big_modulus m F. move=> e i e_gt0 hi /=. rewrite subr0 gtr0_norm ?gtr0E // -ltf_pinv -?topredE /= ?gtr0E //. by rewrite invrK upper_nthrootP. by close. 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)