edits

diff --git a/week4.mdwn b/week4.mdwn
index 6613fb4..1f52cf3 100644 (file)
--- a/week4.mdwn
+++ b/week4.mdwn
@@ -217,7 +217,7 @@ and so on.
 
 #Typed lambda terms#
 
 
 #Typed lambda terms#
 

-Given a set of types `T`, we define the set of typed lambda terms <code>&Lambda;_T</code>,
+Given a set of types `T`, we define the set of typed lambda terms <code>&Lambda;~T~</code>,

 which is the smallest set such that
 
 *    each type `t` has an infinite set of distinct variables, {x^t}_1,
 which is the smallest set such that
 
 *    each type `t` has an infinite set of distinct variables, {x^t}_1,