proposition: Lemma iter_addr (V : zmodType) n x y : iter n (+%R x) y = x *+ n + y :> V.
proof: Proof. by elim: n => [|n ih]; rewrite ?add0r //= ih mulrS addrA. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_fingroup all_algebra all_solvable) mathcomp(all_field)