X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fsubstitution%2Fldrops_ldrop.ma;h=22eed845f8661e197299efba2e583cd3c63cc520;hb=fdb2c62b58006b82c015ba70b494d50c7860e28f;hp=9712e3277c82c70ba8e18909fa1c1a825b978be5;hpb=4aa431513ffa0ce0accf81e6e9ea4b9314d468e3;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/substitution/ldrops_ldrop.ma b/matita/matita/contribs/lambdadelta/basic_2/substitution/ldrops_ldrop.ma
index 9712e3277..22eed845f 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/substitution/ldrops_ldrop.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/substitution/ldrops_ldrop.ma
@@ -26,7 +26,7 @@ lemma ldrops_ldrop_trans: ∀L1,L,des. ⇩*[des] L1 ≡ L → ∀L2,i. ⇩[0, i]
 [ /2 width=7/
 | #L1 #L3 #L #des3 #d #e #_ #HL3 #IHL13 #L2 #i #HL2
   elim (lt_or_ge i d) #Hid
-  [ elim (ldrop_trans_le … HL3 … HL2 ?) -L /2 width=2/ #L #HL3 #HL2
+  [ elim (ldrop_trans_le … HL3 … HL2) -L /2 width=2/ #L #HL3 #HL2
     elim (IHL13 … HL3) -L3 /3 width=7/
   | lapply (ldrop_trans_ge … HL3 … HL2 ?) -L // #HL32
     elim (IHL13 … HL32) -L3 /3 width=7/