proposition: Lemma prim_expr_mod i : z ^+ (i %% n) = z ^+ i.
proof: Proof. exact: expr_mod prim_expr_order. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype bigop finset tuple) mathcomp(div ssralg countalg binomial)