update in ground

[helm.git] / matita / matita / contribs / lambdadelta / ground / arith / ynat_lminus.ma

diff --git a/matita/matita/contribs/lambdadelta/ground/arith/ynat_lminus.ma b/matita/matita/contribs/lambdadelta/ground/arith/ynat_lminus.ma
index 6a2e4dbeeb091bdd3ad4ea1580f85d7cc9a46b86..b1dee6cef22a69780e78bbd0fdc10363812b4f6b 100644 (file)
--- a/matita/matita/contribs/lambdadelta/ground/arith/ynat_lminus.ma
+++ b/matita/matita/contribs/lambdadelta/ground/arith/ynat_lminus.ma
@@ -42,7 +42,7 @@ lemma ylminus_succ_dx (x:ynat) (n): ↓(x-n) = x - ↑n.
 qed.
 
 (*** yminus_SO2 *)
-lemma ylminus_one_dx (x): ↓x = x - (𝟏).
+lemma ylminus_unit_dx (x): ↓x = x - (𝟏).
 // qed.
 
 (*** yminus_Y_inj *)