X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fsubstitution%2Flleq_alt.ma;h=aa9bc1b276f3698351972ebdbcd6eb60db636e27;hb=dffdece065d12d9961a6c3f1222f6d112030336f;hp=470fa107f8bbedba8372d055410907d12d369a94;hpb=a76f56fdad6348b167376093920650379c9936d4;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/substitution/lleq_alt.ma b/matita/matita/contribs/lambdadelta/basic_2/substitution/lleq_alt.ma
index 470fa107f..aa9bc1b27 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/substitution/lleq_alt.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/substitution/lleq_alt.ma
@@ -12,30 +12,30 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "basic_2/relocation/llpx_sn_alt.ma".
+include "basic_2/substitution/llpx_sn_alt.ma".
 include "basic_2/substitution/lleq.ma".
 
 (* LAZY EQUIVALENCE FOR LOCAL ENVIRONMENTS **********************************)
 
-(* Alternative definition ***************************************************)
+(* Alternative definition (not recursive) ***********************************)
 
 theorem lleq_intro_alt: ∀L1,L2,T,d. |L1| = |L2| →
-                        (∀I1,I2,K1,K2,V1,V2,i. d ≤ yinj i → (∀U. ⇧[i, 1] U ≡ T → ⊥) →
+                        (∀I1,I2,K1,K2,V1,V2,i. d ≤ yinj i → (L1 ⊢ i ~ϵ 𝐅*[d]⦃T⦄ → ⊥) →
                            ⇩[i] L1 ≡ K1.ⓑ{I1}V1 → ⇩[i] L2 ≡ K2.ⓑ{I2}V2 →
-                           ∧∧ I1 = I2 & V1 = V2 & K1 ⋕[V1, 0] K2
-                        ) → L1 ⋕[T, d] L2.
-#L1 #L2 #T #d #HL12 #IH @llpx_sn_intro_alt // -HL12
+                           I1 = I2 ∧ V1 = V2
+                        ) → L1 ≡[T, d] L2.
+#L1 #L2 #T #d #HL12 #IH @llpx_sn_alt_inv_llpx_sn @conj // -HL12
 #I1 #I2 #K1 #K2 #V1 #V2 #i #Hid #HnT #HLK1 #HLK2
-elim (IH … HnT HLK1 HLK2) -IH -HnT -HLK1 -HLK2 /2 width=1 by and3_intro/
+@(IH … HnT HLK1 HLK2) -IH -HnT -HLK1 -HLK2 //
 qed.
 
-theorem lleq_inv_gen: ∀L1,L2,T,d. L1 ⋕[T, d] L2 →
+theorem lleq_inv_alt: ∀L1,L2,T,d. L1 ≡[T, d] L2 →
                       |L1| = |L2| ∧
-                      ∀I1,I2,K1,K2,V1,V2,i. d ≤ yinj i → (∀U. ⇧[i, 1] U ≡ T → ⊥) →
+                      ∀I1,I2,K1,K2,V1,V2,i. d ≤ yinj i → (L1 ⊢ i ~ϵ 𝐅*[d]⦃T⦄ → ⊥) →
                       ⇩[i] L1 ≡ K1.ⓑ{I1}V1 → ⇩[i] L2 ≡ K2.ⓑ{I2}V2 →
-                      ∧∧ I1 = I2 & V1 = V2 & K1 ⋕[V1, 0] K2.
-#L1 #L2 #T #d #H elim (llpx_sn_inv_gen … H) -H
+                      I1 = I2 ∧ V1 = V2.
+#L1 #L2 #T #d #H elim (llpx_sn_llpx_sn_alt … H) -H
 #HL12 #IH @conj //
 #I1 #I2 #K1 #K2 #V1 #V2 #i #Hid #HnT #HLK1 #HLK2
-elim (IH … HnT HLK1 HLK2) -IH -HnT -HLK1 -HLK2 /2 width=1 by and3_intro/
+@(IH … HnT HLK1 HLK2) -IH -HnT -HLK1 -HLK2 //
 qed-.