+++ /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 "basic_2/notation/relations/lazyor_5.ma".
-include "basic_2/multiple/frees.ma".
-
-(* POINTWISE UNION FOR LOCAL ENVIRONMENTS ***********************************)
-
-definition llor: ynat → relation4 term lenv lenv lenv ≝ λl,T,L2,L1,L.
- ∧∧ |L1| = |L2| & |L1| = |L|
- & (∀I1,I2,I,K1,K2,K,V1,V2,V,i.
- ⬇[i] L1 ≡ K1.ⓑ{I1}V1 → ⬇[i] L2 ≡ K2.ⓑ{I2}V2 → ⬇[i] L ≡ K.ⓑ{I}V → ∨∨
- (∧∧ yinj i < l & I1 = I & V1 = V) |
- (∧∧ (L1 ⊢ i ϵ 𝐅*[l]⦃T⦄ → ⊥) & I1 = I & V1 = V) |
- (∧∧ l ≤ yinj i & L1 ⊢ i ϵ 𝐅*[l]⦃T⦄ & I2 = I & V2 = V)
- ).
-
-interpretation
- "lazy union (local environment)"
- 'LazyOr L1 T l L2 L = (llor l T L2 L1 L).
-
-(* Basic properties *********************************************************)
-
-(* Note: this can be proved by llor_skip *)
-lemma llor_atom: ∀T,l. ⋆ ⋓[T, l] ⋆ ≡ ⋆.
-#T #l @and3_intro //
-#I1 #I2 #I #K1 #K2 #K #V1 #V2 #V #i #HLK1
-elim (drop_inv_atom1 … HLK1) -HLK1 #H destruct
-qed.