lambdadelta

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / grammar / term_weight.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/grammar/term_weight.ma b/matita/matita/contribs/lambdadelta/basic_2/grammar/term_weight.ma
index 3f9fbef8775b55a2e353acea9aafbedceca23a44..3787abe9355594a583a9700667efd455089b54ac 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/grammar/term_weight.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/grammar/term_weight.ma
@@ -12,6 +12,7 @@
 (*                                                                        *)
 (**************************************************************************)
 
+include "basic_2/notation/functions/weight_1.ma".
 include "basic_2/grammar/term.ma".
 
 (* WEIGHT OF A TERM *********************************************************)
@@ -26,7 +27,7 @@ interpretation "weight (term)" 'Weight T = (tw T).
 (* Basic properties *********************************************************)
 
 (* Basic_1: was: tweight_lt *)
-lemma tw_pos: ∀T. 1 ≤ #{T}.
+lemma tw_pos: ∀T. 1 ≤ ♯{T}.
 #T elim T -T //
 qed.