proposition: Lemma nonzero1 : 1%:F != 0%:F :> type.
proof: Proof. by rewrite piE equivfE !numden_Ratio ?mul1r ?oner_eq0. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(ssrAC choice tuple bigop ssralg poly polydiv) mathcomp(generic_quotient)