X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fstatic_2%2Fstatic%2Faaa_aaa.ma;h=968112846023fbdcca88e05c57f5911a48e82a60;hb=b4283c079ed7069016b8d924bbc7e08872440829;hp=15b4fe4e1d538af46c888fef18ea3755cf5b2936;hpb=ff612dc35167ec0c145864c9aa8ae5e1ebe20a48;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 15b4fe4e1..968112846 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⦄ ⊢
   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-.