X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Farith%2Fnat_pred_succ.ma;h=b7f9918b08d0191cf52391c310700d278be31116;hp=ac01f0f8fc3aefbf78466e018ea478e8db5840f4;hb=888840f6b3a71d3d686b53b702d362ab90ab0038;hpb=19b0a814861157ba05f23877d5cd94059f52c2e8

diff --git a/matita/matita/contribs/lambdadelta/ground/arith/nat_pred_succ.ma b/matita/matita/contribs/lambdadelta/ground/arith/nat_pred_succ.ma
index ac01f0f8f..b7f9918b0 100644
--- a/matita/matita/contribs/lambdadelta/ground/arith/nat_pred_succ.ma
+++ b/matita/matita/contribs/lambdadelta/ground/arith/nat_pred_succ.ma
@@ -27,7 +27,7 @@ qed.
 (* Inversion with nsucc *****************************************************)
 
 (*** nat_split *)
-lemma nat_split (n): ∨∨ 𝟎 = n | n = ↑↓n.
+lemma nat_split_zero_pos (n): ∨∨ 𝟎 = n | n = ↑↓n.
 #n @(nat_ind_succ … n) -n
 /2 width=1 by or_introl, or_intror/
 qed-.