proposition: Lemma gen0 : <<set0>> = 1 :> {set gT}.
proof: Proof. by apply/eqP; rewrite eqEsubset sub1G gen_subG sub0set. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype div path tuple bigop prime finset)