proposition: Lemma constt1 pi : 1.`_pi = 1 :> gT.
proof: Proof. exact: expg1n. 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)