proposition: Lemma cycle_constt pi x : x.`_pi \in <[x]>.
proof: Proof. exact: mem_cycle. Qed.
imports: mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq div) mathcomp(fintype bigop finset prime fingroup morphism) mathcomp(gfunctor automorphism quotient action gproduct) mathcomp(cyclic)