week1: tweaks

[lambda.git] / week1.mdwn

diff --git a/week1.mdwn b/week1.mdwn
index a5e697a..fa1abce 100644 (file)
--- a/week1.mdwn
+++ b/week1.mdwn
@@ -64,11 +64,13 @@ 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)))
+
+lthough.
 
 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: