Merge branch 'pryor'

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@@ -61,7 +61,7 @@ Some authors reserve the term "term" for just variables and abstracts. We won't
 
 Samples of expressions: 
 
-       foo
+>      foo
 
 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: