proposition: Lemma seqn0_all_neq0 (s : seq R) : all_neq0 (seqn0 s).
proof: Proof. by apply: filter_all. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path choice fintype order) mathcomp(prime div bigop ssralg poly polydiv polyorder ssrnum zmodp) mathcomp(polyrcf qe_rcf_th complex)