update in basic_2

[helm.git] / matita / matita / contribs / lambdadelta / basic_1 / subst / defs.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_1/subst/defs.ma b/matita/matita/contribs/lambdadelta/basic_1/subst/defs.ma
index bf89e1618a94e2a321242a0ea3be22a83a744e4e..8d9ed5f07b58db23db35705495aac6f1d033a43c 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_1/subst/defs.ma
+++ b/matita/matita/contribs/lambdadelta/basic_1/subst/defs.ma
@@ -16,8 +16,8 @@
 
 include "basic_1/lift/defs.ma".
 
-let rec subst (d: nat) (v: T) (t: T) on t: T \def match t with [(TSort n) 
-\Rightarrow (TSort n) | (TLRef i) \Rightarrow (match (blt i d) with [true 
+rec definition subst (d: nat) (v: T) (t: T) on t: T \def match t with [(TSort 
+n) \Rightarrow (TSort n) | (TLRef i) \Rightarrow (match (blt i d) with [true 
 \Rightarrow (TLRef i) | false \Rightarrow (match (blt d i) with [true 
 \Rightarrow (TLRef (pred i)) | false \Rightarrow (lift d O v)])]) | (THead k 
 u t0) \Rightarrow (THead k (subst d v u) (subst (s k d) v t0))].