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diff --git a/matita/matita/lib/lambda-delta/syntax/length.ma b/matita/matita/lib/lambda-delta/syntax/length.ma
deleted file mode 100644
index 91e1bd78c..000000000
--- a/matita/matita/lib/lambda-delta/syntax/length.ma
+++ /dev/null
@@ -1,22 +0,0 @@
-(*
-    ||M||  This file is part of HELM, an Hypertextual, Electronic
-    ||A||  Library of Mathematics, developed at the Computer Science
-    ||T||  Department of the University of Bologna, Italy.
-    ||I||
-    ||T||
-    ||A||  This file is distributed under the terms of the
-    \   /  GNU General Public License Version 2
-     \ /
-      V_______________________________________________________________ *)
-
-include "lambda-delta/syntax/lenv.ma".
-
-(* LENGTH *******************************************************************)
-
-(* the length of a local environment *)
-let rec length L ≝ match L with
-[ LSort       ⇒ 0
-| LPair L _ _ ⇒ length L + 1
-].
-
-interpretation "length (local environment)" 'card L = (length L).