+++ /dev/null
-(**************************************************************************)
-(* ___ *)
-(* ||M|| *)
-(* ||A|| A project by Andrea Asperti *)
-(* ||T|| *)
-(* ||I|| Developers: *)
-(* ||T|| The HELM team. *)
-(* ||A|| http://helm.cs.unibo.it *)
-(* \ / *)
-(* \ / This file is distributed under the terms of the *)
-(* v GNU General Public License Version 2 *)
-(* *)
-(**************************************************************************)
-
-include "o-algebra.ma".
-
-definition is_o_saturation: ∀C:OA. C ⇒_1 C → CProp1 ≝
- λC:OA.λA:C ⇒_1 C.∀U,V. (U ≤ A V) =_1 (A U ≤ A V).
-
-definition is_o_reduction: ∀C:OA. C ⇒_1 C → CProp1 ≝
- λC:OA.λJ:C ⇒_1 C.∀U,V. (J U ≤ V) =_1 (J U ≤ J V).
-
-theorem o_saturation_expansive: ∀C,A. is_o_saturation C A → ∀U. U ≤ A U.
- intros; apply (fi ?? (i ??)); apply (oa_leq_refl C).
-qed.
-
-theorem o_saturation_monotone: ∀C:OA.∀A:C ⇒_1 C. is_o_saturation C A → ∀U,V. U ≤ V → A U ≤ A V.
- intros; apply (if ?? (i ??)); apply (oa_leq_trans C);
- [apply V|3: apply o_saturation_expansive ]
- assumption.
-qed.
-
-theorem o_saturation_idempotent: ∀C:OA.∀A:C ⇒_1 C. is_o_saturation C A → ∀U. A (A U) =_1 A U.
- intros; apply (oa_leq_antisym C);
- [ apply (if ?? (i (A U) U)); apply (oa_leq_refl C).
- | apply o_saturation_expansive; assumption]
-qed.