Hint Resolve size_exp_min : lngen.
(* begin hide *)

(* Specifications: *)
Lemma size_exp_close_exp_wrt_exp_rec_mutual :
(forall e1 x1 n1,
size_exp (close_exp_wrt_exp_rec n1 x1 e1) = size_exp e1).
Lemma size_exp_close_exp_wrt_exp_rec_mutual :
(forall e1 x1 n1,
size_exp (close_exp_wrt_exp_rec n1 x1 e1) = size_exp e1).