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@@ -62,6 +62,13 @@ Some authors reserve the term "term" for just variables and abstracts. We'll pro
 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