- advances on lfxs for lfpxs

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / rt_computation / lfpxs_length.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/lfpxs_length.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/lfpxs_length.ma
new file mode 100644 (file)
index 0000000..ac2f64d
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/lfpxs_length.ma
@@ -0,0 +1,7 @@
+(* Basic forward lemmas *****************************************************)
+
+(* Forward lemmas with length for local environments ************************)
+
+(* Basic_2A1: was just: lpxs_fwd_length *)
+lemma lfpxs_fwd_length: ∀h,o,G,L1,L2. ⦃G, L1⦄ ⊢ ⬈*[h, o] L2 → |L1| = |L2|.
+/2 width=2 by TC_lpx_sn_fwd_length/ qed-.