X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Farith%2Fnat_pred.ma;h=3367fe66ad4b7c992a5f2798912216f6f3e53992;hp=d7f79d76b8084d89079406c281a86de8872545f8;hb=0bcf2dc1a27e38cb6cd3d44eb838d652926841e0;hpb=7e120a2bf2e6c0882b4f4b376c5861e001945cf4

diff --git a/matita/matita/contribs/lambdadelta/ground/arith/nat_pred.ma b/matita/matita/contribs/lambdadelta/ground/arith/nat_pred.ma
index d7f79d76b..3367fe66a 100644
--- a/matita/matita/contribs/lambdadelta/ground/arith/nat_pred.ma
+++ b/matita/matita/contribs/lambdadelta/ground/arith/nat_pred.ma
@@ -44,7 +44,7 @@ lemma npred_zero: 𝟎 = ↓𝟎.
 lemma npred_inj (p): ↓p = ↓(ninj p).
 // qed.
 
-lemma npred_one: 𝟎 = ↓𝟏.
+lemma npred_unit: 𝟎 = ↓𝟏.
 // qed.
 
 lemma npred_psucc (p): ninj p = ↓↑p.
@@ -54,7 +54,7 @@ lemma npred_psucc (p): ninj p = ↓↑p.
 
 lemma npred_pnat_inv_refl (p): ninj p = ↓p → ⊥.
 *
-[ <npred_one #H destruct
+[ <npred_unit #H destruct
 | #p /3 width=2 by psucc_inv_refl, eq_inv_ninj_bi/
 ]
 qed-.