X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambda_delta%2Fbasic_2%2Fgrammar%2Fterm_simple.ma;h=83aff07c497541a142bbfaabfbb04fdbcd11cc86;hb=b074ebf6441993694c6e39e4eaeeb58a3186f479;hp=b51523544811b1d089a69a322df7d3ca395d36f9;hpb=a8c166f1e1baeeae04553058bd179420ada8bbe7;p=helm.git

diff --git a/matita/matita/contribs/lambda_delta/basic_2/grammar/term_simple.ma b/matita/matita/contribs/lambda_delta/basic_2/grammar/term_simple.ma
index b51523544..83aff07c4 100644
--- a/matita/matita/contribs/lambda_delta/basic_2/grammar/term_simple.ma
+++ b/matita/matita/contribs/lambda_delta/basic_2/grammar/term_simple.ma
@@ -25,17 +25,22 @@ interpretation "simple (term)" 'Simple T = (simple T).
 
 (* Basic inversion lemmas ***************************************************)
 
-fact simple_inv_bind_aux: ∀T. 𝐒[T] → ∀J,W,U. T = ⓑ{J} W. U → False.
+fact simple_inv_bind_aux: ∀T. 𝐒⦃T⦄ → ∀J,W,U. T = ⓑ{J} W. U → ⊥.
 #T * -T
 [ #I #J #W #U #H destruct
 | #I #V #T #J #W #U #H destruct
 ]
 qed.
 
-lemma simple_inv_bind: ∀I,V,T. 𝐒[ⓑ{I} V. T] → False.
+lemma simple_inv_bind: ∀I,V,T. 𝐒⦃ⓑ{I} V. T⦄ → ⊥.
 /2 width=6/ qed-.
 
-lemma simple_inv_pair: ∀I,V,T.  𝐒[②{I}V.T] → ∃J. I = Flat2 J.
+lemma simple_inv_pair: ∀I,V,T.  𝐒⦃②{I}V.T⦄ → ∃J. I = Flat2 J.
 * /2 width=2/ #I #V #T #H
 elim (simple_inv_bind … H)
 qed-.
+
+(*
+lemma mt: ∀R1,R2:Prop. (R1 → R2) → (R2 → ⊥) → R1 → ⊥.
+/3 width=1/ qed-.
+*)