X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_computation%2Fcsx.ma;h=c7e8e3dd3778957436f40dc18e15937f7374c480;hb=c3832abc23bb0907df2deb6751f4a46d213675b7;hp=5fe697558fe25e50007c60c00ae0e13ddf427f1c;hpb=228776cd21ca563e6dc44bfdf7746e69dc7b66d6;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx.ma
index 5fe697558..c7e8e3dd3 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/csx.ma
@@ -45,19 +45,6 @@ lemma csx_intro: ∀h,o,G,L,T1.
                  ⦃G, L⦄ ⊢ ⬈*[h, o] 𝐒⦃T1⦄.
 /4 width=1 by SN_intro/ qed.
 
-lemma csx_sort: ∀h,o,G,L,s. ⦃G, L⦄ ⊢ ⬈*[h, o] 𝐒⦃⋆s⦄.
-#h #o #G #L #s elim (deg_total h o s)
-#d generalize in match s; -s elim d -d
-[ #s1 #Hs1 @csx_intro #X #H #HX elim HX -HX
-  elim (cpx_inv_sort1 … H) -H #H destruct //
-  /3 width=3 by tdeq_sort, deg_next/
-| #d #IH #s #Hsd lapply (deg_next_SO … Hsd) -Hsd
-  #Hsd @csx_intro #X #H #HX
-  elim (cpx_inv_sort1 … H) -H #H destruct /2 width=1 by/
-  elim HX //
-]
-qed.
-
 (* Basic forward lemmas *****************************************************)
 
 fact csx_fwd_pair_sn_aux: ∀h,o,G,L,U. ⦃G, L⦄ ⊢ ⬈*[h, o] 𝐒⦃U⦄ →