proposition: Lemma pseries1 pi gT (G : {group gT}) : 'O_{pi}(G) = 'O_pi(G).
proof: Proof. exact: pcore_mod1. 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)