week1: tweaks

Signed-off-by: Jim Pryor <profjim@jimpryor.net>

diff --git a/week1.mdwn b/week1.mdwn
index f449ed4..a5e697a 100644 (file)
--- a/week1.mdwn
+++ b/week1.mdwn
@@ -64,11 +64,11 @@ Examples of expressions:
        x
        (y x)
        (x x)
        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:
 
 
 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: