proposition: Lemma pseriesS pis : GFunctor.hereditary (@pseries pis).
proof: Proof. exact: (morphim_pseries pis). 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)