proposition: Lemma quotient_pseries pis pi gT (G : {group gT}) : pseries (rcons pis pi) G / pseries pis G = 'O_pi(G / pseries pis G).
proof: Proof. by rewrite pseries_rcons quotient_pcore_mod. 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)