update in models and ground_2

[helm.git] / matita / matita / contribs / lambdadelta / apps_2 / etc / models / model.etc

diff --git a/matita/matita/contribs/lambdadelta/apps_2/etc/models/model.etc b/matita/matita/contribs/lambdadelta/apps_2/etc/models/model.etc
new file mode 100644 (file)
index 0000000..51ea8d8
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/apps_2/etc/models/model.etc
@@ -0,0 +1,7 @@
+
+lemma pippo: ∀M,v1,v2,d,i. [i⬐d] v1 ≐⦋M⦌ v2 → v1 ≐⦋M⦌ ↓[i,1] v2.
+#M #v1 #v2 #d #i #H #j elim (lt_or_ge … j i) #Hij
+[ >lower_lt // <(H j) >raise_lt //
+| >lower_ge // <(H (j+1)) >raise_gt /2 width=1 by le_S_S/
+]
+qed-.