week1 tweaks

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

diff --git a/week1.mdwn b/week1.mdwn
index 729b14d..67d5828 100644 (file)
--- a/week1.mdwn
+++ b/week1.mdwn
@@ -185,7 +185,7 @@ Different authors use different notations. Some authors use the term "contractio
 
        M ~~> N
 
-We'll mean that you can get from M to N by one or more reduction steps. Hankin uses the symbol &rarr; for one-step contraction, and the symbol &rarr;> for zero-or-more step reduction. Hindley and Seldin use <code>|&gt;<sub>1</sub></code> and <code>|&gt;</code>.
+We'll mean that you can get from M to N by one or more reduction steps. Hankin uses the symbol <code>&rarr;</code> for one-step contraction, and the symbol <code>&8608;</code> for zero-or-more step reduction. Hindley and Seldin use <code>&#8883;<sub>1</sub></code> and <code>&#8883;</code>.
 
 When M and N are such that there's some P that M reduces to by zero or more steps, and that N also reduces to by zero or more steps, then we say that M and N are **beta-convertible**. We'll write that like this: