proposition: Lemma botEtprod : \bot = [tuple of nseq n \bot] :> n.-tuple T.
proof: Proof. by []. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)