proposition: Lemma Zp_unit_isog : isog (units_Zp #[a]) (Aut <[a]>).
proof: Proof. exact: isom_isog Zp_unit_isom. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice div) mathcomp(fintype bigop prime finset fingroup morphism) mathcomp(perm automorphism quotient gproduct ssralg) mathcomp(finalg zmodp poly)