Section is_derive_mult.
Context {K : AbsRing}.
End is_derive_mult.
(** * Exponential function *)
(** Definition *)
(** Limits *)

Lemma ex_lim_exp (x : Rbar) : ex_lim (fun y => exp y) x.
Lemma Lim_exp (x : Rbar) :
Lim (fun y => exp y) x =
match x with
| Finite x => exp x
| p_infty => p_infty
| m_infty => 0
end.