X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fstatic_2%2Fstatic%2Faaa_aaa.ma;h=8d06e6607f91b759a0e79205d8df033a7a201d96;hb=2e4a7c54ef77c10cb1cef4b59518c473245ea935;hp=bd1eb91a25d59b6a5db5dcf9929dee688f895e20;hpb=f308429a0fde273605a2330efc63268b4ac36c99;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/static_2/static/aaa_aaa.ma b/matita/matita/contribs/lambdadelta/static_2/static/aaa_aaa.ma
index bd1eb91a2..8d06e6607 100644
--- a/matita/matita/contribs/lambdadelta/static_2/static/aaa_aaa.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/static/aaa_aaa.ma
@@ -18,7 +18,7 @@ include "static_2/static/aaa.ma".
 
 (* Main inversion lemmas ****************************************************)
 
-theorem aaa_mono: ∀G,L,T,A1. ⦃G,L⦄ ⊢ T ⁝ A1 → ∀A2. ⦃G,L⦄ ⊢ T ⁝ A2 → A1 = A2.
+theorem aaa_mono: ∀G,L,T,A1. ❨G,L❩ ⊢ T ⁝ A1 → ∀A2. ❨G,L❩ ⊢ T ⁝ A2 → A1 = A2.
 #G #L #T #A1 #H elim H -G -L -T -A1
 [ #G #L #s #A2 #H >(aaa_inv_sort … H) -H //
 | #I1 #G #L #V1 #B #_ #IH #A2 #H
@@ -36,3 +36,22 @@ theorem aaa_mono: ∀G,L,T,A1. ⦃G,L⦄ ⊢ T ⁝ A1 → ∀A2. ⦃G,L⦄ ⊢ T
   elim (aaa_inv_cast … H) -H /2 width=1 by/
 ]
 qed-.
+
+(* Advanced inversion lemmas ************************************************)
+
+lemma aaa_aaa_inv_appl (G) (L) (V) (T) (B) (X):
+      ∀A. ❨G,L❩ ⊢ ⓐV.T ⁝ A → ❨G,L❩ ⊢ V ⁝ B → ❨G,L❩⊢ T ⁝ X → ②B.A = X.
+#G #L #V #T #B #X #A #H #H1V #H1T
+elim (aaa_inv_appl … H) -H #B0 #H2V #H2T
+lapply (aaa_mono … H2V … H1V) -V #H destruct
+lapply (aaa_mono … H2T … H1T) -G -L -T //
+qed-.
+
+lemma aaa_aaa_inv_cast (G) (L) (U) (T) (B) (A):
+      ∀X. ❨G,L❩ ⊢ ⓝU.T ⁝ X → ❨G,L❩ ⊢ U ⁝ B → ❨G,L❩⊢ T ⁝ A → ∧∧ B = X & A = X.
+#G #L #U #T #B #A #X #H #H1U #H1T
+elim (aaa_inv_cast … H) -H #H2U #H2T
+lapply (aaa_mono … H1U … H2U) -U #HB
+lapply (aaa_mono … H1T … H2T) -G -L -T #HA
+/2 width=1 by conj/
+qed-.