(** ** Operations and order *)

(* Specifications: *)
Lemma is_LimSup_LimInf_seq_le (u : nat -> R) (ls li : Rbar) :
is_LimSup_seq u ls -> is_LimInf_seq u li -> Rbar_le li ls.
Lemma LimSup_LimInf_seq_le (u : nat -> R) :
Rbar_le (LimInf_seq u) (LimSup_seq u).