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diff --git a/helm/software/lambda-delta/src/basic_rg/brg.ml b/helm/software/lambda-delta/src/basic_rg/brg.ml
deleted file mode 100644
index be4e6f9b9..000000000
--- a/helm/software/lambda-delta/src/basic_rg/brg.ml
+++ /dev/null
@@ -1,74 +0,0 @@
-(*
-    ||M||  This file is part of HELM, an Hypertextual, Electronic        
-    ||A||  Library of Mathematics, developed at the Computer Science     
-    ||T||  Department, University of Bologna, Italy.                     
-    ||I||                                                                
-    ||T||  HELM is free software; you can redistribute it and/or         
-    ||A||  modify it under the terms of the GNU General Public License   
-    \   /  version 2 or (at your option) any later version.              
-     \ /   This software is distributed as is, NO WARRANTY.              
-      V_______________________________________________________________ *)
-
-(* kernel version: basic, relative, global *)
-(* note          : ufficial basic lambda-delta *) 
-
-module E = Entity
-module N = Level
-
-type uri = E.uri
-type attrs = E.attrs
-
-type bind = Void                   (*             *)
-          | Abst of N.level * term (* level, type *)
-          | Abbr of term           (* body        *)
-
-and term = Sort of attrs * int         (* attrs, hierarchy index *)
-         | LRef of attrs * int         (* attrs, position index *)
-         | GRef of attrs * uri         (* attrs, reference *)
-         | Cast of attrs * term * term (* attrs, type, term *)
-         | Appl of attrs * term * term (* attrs, argument, function *)
-         | Bind of attrs * bind * term (* attrs, binder, scope *)
-
-type entity = term E.entity (* attrs, uri, binder *)
-
-type lenv = Null
-(* Cons: tail, relative local environment, attrs, binder *) 
-          | Cons of lenv * lenv * attrs * bind 
-
-(* Currified constructors ***************************************************)
-
-let abst n w = Abst (n, w)
-
-let abbr v = Abbr v
-
-let lref a i = LRef (a, i)
-
-let cast a u t = Cast (a, u, t)
-
-let appl a u t = Appl (a, u, t)
-
-let bind a b t = Bind (a, b, t)
-
-let bind_abst n a u t = Bind (a, Abst (n, u), t)
-
-let bind_abbr a v t = Bind (a, Abbr v, t)
-
-let bind_void a t = Bind (a, Void, t)
-
-(* local environment handling functions *************************************)
-
-let empty = Null
-
-let push e c a b = Cons (e, c, a, b)
-
-let rec get i = function
-   | Null                         -> Null, Null, [], Void
-   | Cons (e, c, a, b) when i = 0 -> e, c, a, b
-   | Cons (e, _, _, _)            -> get (pred i) e
-
-let get e i = get i e
-
-(* used in BrgOutput.pp_lenv *)
-let rec fold_right f map e x = match e with   
-   | Null              -> f x
-   | Cons (e, c, a, b) -> fold_right (map f e c a b) map e x