(no commit message)

[lambda.git] / assignment1.mdwn

diff --git a/assignment1.mdwn b/assignment1.mdwn
index 93136f2..cc535c2 100644 (file)
--- a/assignment1.mdwn
+++ b/assignment1.mdwn
@@ -26,7 +26,8 @@ In Racket, these can be defined like this:
        (define true (lambda (t) (lambda (f) t)))
        (define false (lambda (t) (lambda (f) f)))
 
-8. [8] Define a "neg" operator that negates "true" and "false".
+    8. Define a "neg" operator that negates "true" and "false".
+
 Expected behavior: 
 
     (((neg true) 10) 20) 
@@ -37,19 +38,23 @@ evaluates to 20, and
 
 evaluates to 10.
 
-9. [9] Define an "and" operator.
+    9. Define an "and" operator.
+
+    10. Define an "xor" operator. 
 
-10. [10] Define an "xor" operator. (If you haven't seen this term before, here's a truth table:
+(If you haven't seen this term before, here's a truth table:
 
-       true xor true = false
-       true xor false = true
-       false xor true = true
-       false xor false = false
+    true xor true = false
+    true xor false = true
+    false xor true = true
+    false xor false = false
 
 )
 
-* 11. Inspired by our definition of boolean values, propose a data structure
-capable of representing one of the two values "black" or "white". If we have
+    11. Inspired by our definition of boolean values, propose a data structure
+        capable of representing one of the two values "black" or "white". 
+
+If we have
 one of those values, call it a black-or-white-value, we should be able to
 write: