X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fdynamic%2Flsubv_drops.ma;fp=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fdynamic%2Flsubv_drops.ma;h=859eefd95dad0b9b8d8af6801bbd2599c797a825;hb=67fe9cec87e129a2a41c75d7ed8456a6f3314421;hp=6b0daf223665780c6e1cf4516219e732a8da1296;hpb=86861e6f031df66824a381527dfe847029ff72bc;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/lsubv_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/lsubv_drops.ma
index 6b0daf223..859eefd95 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/lsubv_drops.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/lsubv_drops.ma
@@ -23,8 +23,8 @@ include "basic_2/dynamic/lsubv.ma".
 (* Basic_2A1: includes: lsubsv_drop_O1_conf *)
 lemma lsubv_drops_conf_isuni (h) (a) (G):
       ∀L1,L2. G ⊢ L1 ⫃![h,a] L2 →
-      ∀b,f,K1. 𝐔⦃f⦄ → ⬇*[b,f] L1 ≘ K1 →
-      ∃∃K2. G ⊢ K1 ⫃![h,a] K2 & ⬇*[b,f] L2 ≘ K2.
+      ∀b,f,K1. 𝐔⦃f⦄ → ⇩*[b,f] L1 ≘ K1 →
+      ∃∃K2. G ⊢ K1 ⫃![h,a] K2 & ⇩*[b,f] L2 ≘ K2.
 #h #a #G #L1 #L2 #H elim H -L1 -L2
 [ /2 width=3 by ex2_intro/
 | #I #L1 #L2 #HL12 #IH #b #f #K1 #Hf #H
@@ -48,8 +48,8 @@ qed-.
 (* Basic_2A1: includes: lsubsv_drop_O1_trans *)
 lemma lsubv_drops_trans_isuni (h) (a) (G):
       ∀L1,L2. G ⊢ L1 ⫃![h,a] L2 →
-      ∀b,f,K2. 𝐔⦃f⦄ → ⬇*[b,f] L2 ≘ K2 →
-      ∃∃K1. G ⊢ K1 ⫃![h,a] K2 & ⬇*[b,f] L1 ≘ K1.
+      ∀b,f,K2. 𝐔⦃f⦄ → ⇩*[b,f] L2 ≘ K2 →
+      ∃∃K1. G ⊢ K1 ⫃![h,a] K2 & ⇩*[b,f] L1 ≘ K1.
 #h #a #G #L1 #L2 #H elim H -L1 -L2
 [ /2 width=3 by ex2_intro/
 | #I #L1 #L2 #HL12 #IH #b #f #K2 #Hf #H