X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fdynamic%2Fcnv_drops.ma;h=25bf405df87422cd0aa11e66d05705d4951b8be9;hb=67fe9cec87e129a2a41c75d7ed8456a6f3314421;hp=bb1e540fea8a71e0e439c194cddf121c4bc68b1f;hpb=86861e6f031df66824a381527dfe847029ff72bc;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_drops.ma
index bb1e540fe..25bf405df 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_drops.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/cnv_drops.ma
@@ -22,7 +22,7 @@ include "basic_2/dynamic/cnv.ma".
 (* Basic_2A1: uses: snv_lref *)
 lemma cnv_lref_drops (h) (a) (G):
       ∀I,K,V,i,L. ⦃G,K⦄ ⊢ V ![h,a] →
-      ⬇*[i] L ≘ K.ⓑ{I}V → ⦃G,L⦄ ⊢ #i ![h,a].
+      ⇩*[i] L ≘ K.ⓑ{I}V → ⦃G,L⦄ ⊢ #i ![h,a].
 #h #a #G #I #K #V #i elim i -i
 [ #L #HV #H
   lapply (drops_fwd_isid … H ?) -H // #H destruct
@@ -38,7 +38,7 @@ qed.
 (* Basic_2A1: uses: snv_inv_lref *)
 lemma cnv_inv_lref_drops (h) (a) (G):
       ∀i,L. ⦃G,L⦄ ⊢ #i ![h,a] →
-      ∃∃I,K,V. ⬇*[i] L ≘ K.ⓑ{I}V & ⦃G,K⦄ ⊢ V ![h,a].
+      ∃∃I,K,V. ⇩*[i] L ≘ K.ⓑ{I}V & ⦃G,K⦄ ⊢ V ![h,a].
 #h #a #G #i elim i -i
 [ #L #H
   elim (cnv_inv_zero … H) -H #I #K #V #HV #H destruct
@@ -52,14 +52,14 @@ qed-.
 
 lemma cnv_inv_lref_pair (h) (a) (G):
       ∀i,L. ⦃G,L⦄ ⊢ #i ![h,a] →
-      ∀I,K,V. ⬇*[i] L ≘ K.ⓑ{I}V → ⦃G,K⦄ ⊢ V ![h,a].
+      ∀I,K,V. ⇩*[i] L ≘ K.ⓑ{I}V → ⦃G,K⦄ ⊢ V ![h,a].
 #h #a #G #i #L #H #I #K #V #HLK
 elim (cnv_inv_lref_drops … H) -H #Z #Y #X #HLY #HX
 lapply (drops_mono … HLY … HLK) -L #H destruct //
 qed-.
 
 lemma cnv_inv_lref_atom (h) (a) (b) (G):
-      ∀i,L. ⦃G,L⦄ ⊢ #i ![h,a] → ⬇*[b,𝐔❴i❵] L ≘ ⋆ → ⊥.
+      ∀i,L. ⦃G,L⦄ ⊢ #i ![h,a] → ⇩*[b,𝐔❴i❵] L ≘ ⋆ → ⊥.
 #h #a #b #G #i #L #H #Hi
 elim (cnv_inv_lref_drops … H) -H #Z #Y #X #HLY #_
 lapply (drops_gen b … HLY) -HLY #HLY
@@ -68,7 +68,7 @@ qed-.
 
 lemma cnv_inv_lref_unit (h) (a) (G):
       ∀i,L. ⦃G,L⦄ ⊢ #i ![h,a] →
-      ∀I,K. ⬇*[i] L ≘ K.ⓤ{I} → ⊥.
+      ∀I,K. ⇩*[i] L ≘ K.ⓤ{I} → ⊥.
 #h #a #G #i #L #H #I #K #HLK
 elim (cnv_inv_lref_drops … H) -H #Z #Y #X #HLY #_
 lapply (drops_mono … HLY … HLK) -L #H destruct