X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=week1.mdwn;h=a5e697a5026751b9fb6b261f657cd2f91f69c99a;hp=f449ed49e8663878d519af2e55ddea82fd44603a;hb=aa82fa84a083b7b90862f5f4c368f07dd62ae717;hpb=c3468a4b473b3cff1028e1c3d652719595d32fd3

diff --git a/week1.mdwn b/week1.mdwn
index f449ed49..a5e697a5 100644
--- a/week1.mdwn
+++ b/week1.mdwn
@@ -64,11 +64,11 @@ Examples of expressions:
 	x
 	(y x)
 	(x x)
-	(\x y)
-	(\x x)
-	(\x (\y x))
-	(x (\x x))
-	((\x (x x)) (\x (x x)))
+	(_x y)
+	(_x x)
+	(_x (_y x))
+	(x (_x x))
+	((_x (x x)) (_x (x x)))
 
 The *lambda* calculus has an associated proof theory. For now, we can regard the proof theory as having just one rule, called the rule of **beta-reduction** or "beta-contraction". Suppose you have some expression of the form: