remove link to advanced from index

[lambda.git] / week4.mdwn

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@@ -1,9 +1,6 @@
 [[!toc]]
 
-#These notes return to the topic of fixed point combiantors for one more return to the topic of fixed point combinators#
-
-#Q: How do you know that every term in the untyped lambda calculus has
-a fixed point?#
+#Q: How do you know that every term in the untyped lambda calculus has a fixed point?#
 
 A: That's easy: let `T` be an arbitrary term in the lambda calculus.  If
 `T` has a fixed point, then there exists some `X` such that `X <~~>
@@ -174,3 +171,5 @@ so A 4 x is to A 3 x as hyper-exponentiation is to exponentiation...
 *    I hear that `Y` delivers the *least* fixed point.  Least
      according to what ordering?  How do you know it's least?
      Is leastness important?
+
+