X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fsubstitution%2Ftps.ma;h=38b1dfe7cdda5b6d57bf265da03fdc87e6033335;hb=fba384e357ed3c8781fc018c2c16f2b40df144af;hp=6872e4b2be305f503a25ab1c18b84daff77c649b;hpb=38c81062ae1aedf89d426d5dcd9a27824c4b0fb0;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/substitution/tps.ma b/matita/matita/contribs/lambdadelta/basic_2/substitution/tps.ma
index 6872e4b2b..38b1dfe7c 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/substitution/tps.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/substitution/tps.ma
@@ -253,7 +253,7 @@ lemma tps_inv_refl_O2: ∀L,T1,T2,d. L ⊢ T1 ▶ [d, 0] T2 → T1 = T2.
 
 (* Basic forward lemmas *****************************************************)
 
-lemma tps_fwd_tw: ∀L,T1,T2,d,e. L ⊢ T1 ▶ [d, e] T2 → #{T1} ≤ #{T2}.
+lemma tps_fwd_tw: ∀L,T1,T2,d,e. L ⊢ T1 ▶ [d, e] T2 → ♯{T1} ≤ ♯{T2}.
 #L #T1 #T2 #d #e #H elim H -L -T1 -T2 -d -e normalize
 /3 by monotonic_le_plus_l, le_plus/ (**) (* just /3 width=1/ is too slow *)
 qed-.