X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=inline;f=matita%2Fmatita%2Fcontribs%2Flambda%2Fterm.ma;h=92a838fb4cbe8b8f3bccdef807e66a817f20b307;hb=5ca47b58902b9f2583ad1354b860c04ea62df46c;hp=660830d2784222dac9bc681e15b5d144aaf24edc;hpb=2199f327081f49b21bdcd23d702b5e07ea4f58ce;p=helm.git

diff --git a/matita/matita/contribs/lambda/term.ma b/matita/matita/contribs/lambda/term.ma
index 660830d27..92a838fb4 100644
--- a/matita/matita/contribs/lambda/term.ma
+++ b/matita/matita/contribs/lambda/term.ma
@@ -18,11 +18,11 @@ include "preamble.ma".
 
 (* TERM STRUCTURE ***********************************************************)
 
-(* Policy: term metavariables: A, B, C, D, M, N
-           de Bruijn indexes : i, j
+(* Policy: term metavariables : A, B, C, D, M, N
+           depth metavariables: i, j
 *)
 inductive term: Type[0] ≝
-| VRef: nat → term         (* variable reference by index *)
+| VRef: nat  → term        (* variable reference by depth *)
 | Abst: term → term        (* function formation          *)
 | Appl: term → term → term (* function application        *)
 .
@@ -47,7 +47,7 @@ notation "hvbox( 𝛌  . term 46 A )"
 notation "hvbox( @ term 46 C . break term 46 A )"
    non associative with precedence 46
    for @{ 'Application $C $A }.
-
+(*
 definition appl_compatible_dx: predicate (relation term) ≝ λR.
                                ∀B,A1,A2. R A1 A2 → R (@B.A1) (@B.A2).
 
@@ -55,3 +55,4 @@ lemma star_appl_compatible_dx: ∀R. appl_compatible_dx R →
                                appl_compatible_dx (star … R).
 #R #HR #B #A1 #A2 #H elim H -A2 // /3 width=3/
 qed.
+*)