X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=week1.mdwn;h=8484b17f975b74344e233ed94868b6e2a65c3b6e;hp=e8154e3cdcf1fbe6c21828c266662113bc7f9971;hb=6885a008cfcbb9fed72b19db62a6046665860c44;hpb=1f97960ab1bdd7a1328fe64714e8b36b38bd7a1e

diff --git a/week1.mdwn b/week1.mdwn
index e8154e3c..8484b17f 100644
--- a/week1.mdwn
+++ b/week1.mdwn
@@ -61,18 +61,22 @@ Some authors reserve the term "term" for just variables and abstracts. We won't
 
 Examples of expressions:
 
-	x
-	(y 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:
-
-	((\a M) N)
+<blockquote><code>
+x  
+(y x)  
+(x x)  
+(\x y)  
+(\x x)  
+(\x (\y x))  
+(x (\x x))  
+((\x (x x)) (\x (x x)))
+</code></blockquote>
+
+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:
+
+	((lambda a M) N)
 
 that is, an application of an abstract to some other expression. This compound form is called a **redex**, meaning it's a "beta-reducible expression." `(\a M)` is called the **head** of the redex; `N` is called the **argument**, and `M` is called the **body**.