proposition: Lemma meetEtprod t1 t2 : t1 `&` t2 = [tuple of [seq x.1 `&` x.2 | x <- zip t1 t2]].
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)