proposition: Lemma orderXdvd a n : #[a ^+ n] %| #[a].
proof: Proof. by apply: order_dvdG; apply: mem_cycle. 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)