proposition: Lemma expgSr x n : x ^+ n.+1 = x ^+ n * x.
proof: Proof. by rewrite -addn1 expgD expg1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype div path tuple bigop prime finset)