X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fs_computation%2Ffqus_drops.ma;h=cfcecbb009222216e9340c99e601b19d5e16a0ea;hp=a1adcfcf53e93cc62b86d44d24e43c46db6fe20c;hb=222044da28742b24584549ba86b1805a87def070;hpb=98fbba1b68d457807c73ebf70eb2a48696381da4

diff --git a/matita/matita/contribs/lambdadelta/basic_2/s_computation/fqus_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/s_computation/fqus_drops.ma
index a1adcfcf5..cfcecbb00 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/s_computation/fqus_drops.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/s_computation/fqus_drops.ma
@@ -19,7 +19,7 @@ include "basic_2/s_computation/fqus_fqup.ma".
 
 (* Properties with generic slicing for local environments *******************)
 
-lemma fqus_drops: ∀b,G,L,K,T,U,i. ⬇*[i] L ≡ K → ⬆*[i] T ≡ U →
+lemma fqus_drops: ∀b,G,L,K,T,U,i. ⬇*[i] L ≘ K → ⬆*[i] T ≘ U →
                   ⦃G, L, U⦄ ⊐*[b] ⦃G, K, T⦄.
 #b #G #L #K #T #U * /3 width=3 by fqup_drops_succ, fqup_fqus/
 #HLK #HTU <(lifts_fwd_isid … HTU) -U // <(drops_fwd_isid … HLK) -K //