(** Functions *)

Definition Rbar_lub (E : Rbar -> Prop)
  := proj1_sig (Rbar_ex_lub E).Definition Rbar_glb (E : Rbar -> Prop)
  := proj1_sig (Rbar_ex_glb E).

Lemma Rbar_opp_glb_lub (E : Rbar -> Prop) : Rbar_glb (fun x => E (Rbar_opp x)) = Rbar_opp (Rbar_lub E).