X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=week1.mdwn;h=8484b17f975b74344e233ed94868b6e2a65c3b6e;hp=8d1ad0dd3a0ec34188415d1b6d76dc817c1956f2;hb=6885a008cfcbb9fed72b19db62a6046665860c44;hpb=75b0a95a29b968c3a6c42c04bdb4a908f586cd15

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@@ -62,21 +62,21 @@ Some authors reserve the term "term" for just variables and abstracts. We won't
 Examples of expressions:
 
 <blockquote><code>
-x<p>
-(y x)<p>
-(x x)<p>
-(\x y)<p>
-(\x x)<p>
-(\x (\y x))<p>
-(x (\x x))<p>
-((\x (x x)) (\x (x x)))<p>
+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:
 
-	((\a M) N)
+	((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**.