X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Frelocation%2Fxap.ma;h=0f367b218935fe30bb24078908b49b3e678c10d5;hp=aef0c26e158b9db9e18d6d6be952a6c6a385a17e;hb=b0c6bbd5db69489a5ebd1b36de6685fa6de441b3;hpb=829e3a8af3229c4e625245f7265dd67939da98c4

diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/xap.ma b/matita/matita/contribs/lambdadelta/ground/relocation/xap.ma
index aef0c26e1..0f367b218 100644
--- a/matita/matita/contribs/lambdadelta/ground/relocation/xap.ma
+++ b/matita/matita/contribs/lambdadelta/ground/relocation/xap.ma
@@ -77,3 +77,8 @@ theorem tr_xap_eq_repl (i):
 <tr_xap_unfold <tr_xap_unfold
 /3 width=1 by tr_push_eq_repl, tr_nap_eq_repl/
 qed.
+
+lemma tr_nap_plus (f) (m) (n):
+      ⇂*[↑n]f＠❨m❩+f＠§❨n❩ = f＠§❨m+n❩.
+/2 width=1 by eq_inv_nsucc_bi/
+qed.