Section is_derive_mult.
Context {K : AbsRing}.
End is_derive_mult.
(** * Exponential function *)
(** Definition *)
(** Limits *)
(** Integral *)
(** * Natural logarithm *)
(** * Unnormalized sinc *)

Lemma is_lim_sinc_0 : is_lim (fun x => sin x / x) 0 1.