X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fstatic%2Ffrees_frees.ma;h=17e1f983d746086ad6e2cc612245b4e0d6ee885c;hp=5485e2359d889f72bb5c03408172286bb3d71a26;hb=222044da28742b24584549ba86b1805a87def070;hpb=98fbba1b68d457807c73ebf70eb2a48696381da4

diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/frees_frees.ma b/matita/matita/contribs/lambdadelta/basic_2/static/frees_frees.ma
index 5485e2359..17e1f983d 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/static/frees_frees.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/frees_frees.ma
@@ -18,7 +18,7 @@ include "basic_2/static/frees.ma".
 
 (* Main inversion lemmas ****************************************************)
 
-theorem frees_mono: ∀f1,L,T. L ⊢ 𝐅*⦃T⦄ ≡ f1 → ∀f2. L ⊢ 𝐅*⦃T⦄ ≡ f2 → f1 ≗ f2.
+theorem frees_mono: ∀f1,L,T. L ⊢ 𝐅*⦃T⦄ ≘ f1 → ∀f2. L ⊢ 𝐅*⦃T⦄ ≘ f2 → f1 ≡ f2.
 #f1 #L #T #H elim H -f1 -L -T
 [ /3 width=3 by frees_inv_sort, isid_inv_eq_repl/
 | #f1 #i #Hf1 #g2 #H