X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fetc%2Ffpbg%2Ffpbg_lift.etc;h=04110fe2129647f415d49fa3e6cf394b9ba11ff5;hb=e23331eef5817eaa6c5e1c442d1d6bbb18650573;hp=4fe3be22f29b33c3a3895962605099231aeafffa;hpb=dd74d1964ef07de249385a48f28302b427c0d287;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/fpbg/fpbg_lift.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/fpbg/fpbg_lift.etc
index 4fe3be22f..04110fe21 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/etc/fpbg/fpbg_lift.etc
+++ b/matita/matita/contribs/lambdadelta/basic_2/etc/fpbg/fpbg_lift.etc
@@ -22,3 +22,7 @@ include "basic_2/computation/fpbg.ma".
 lemma sta_fpbg: ∀h,o,G,L,T1,T2,d. ⦃G, L⦄ ⊢ T1 ▪[h, o] d+1 →
                 ⦃G, L⦄ ⊢ T1 •*[h, 1] T2 → ⦃G, L, T1⦄ >≛[h, o] ⦃G, L, T2⦄.
 /4 width=2 by fpb_fpbg, sta_fpb/ qed.
+
+lemma lstas_fpbg: ∀h,o,G,L,T1,T2,d2. ⦃G, L⦄ ⊢ T1 •*[h, d2] T2 → (T1 = T2 → ⊥) →
+                  ∀d1. d2 ≤ d1 → ⦃G, L⦄ ⊢ T1 ▪[h, o] d1 → ⦃G, L, T1⦄ >≛[h, o] ⦃G, L, T2⦄.
+/3 width=5 by lstas_cpxs, cpxs_fpbg/ qed.