`prefact` if we are forced to.
-#Q. You claimed that the Ackerman function couldn't be implemented using our primitive recursion techniques (such as the techniques that allow us to define addition and multiplication). But you haven't shown that it is possible to define the Ackerman function using full recursion.#
+#Q. You claimed that the Ackermann function couldn't be implemented using our primitive recursion techniques (such as the techniques that allow us to define addition and multiplication). But you haven't shown that it is possible to define the Ackermann function using full recursion.#
A. OK:
* What is it about the variant fixed-point combinators that makes
them compatible with a call-by-value evaluation strategy?
-* How do you know that the Ackerman function can't be computed
+* How do you know that the Ackermann function can't be computed
using primitive recursion techniques?
* What *exactly* is primitive recursion?
> now `extract_head` should return the leftmost head directly, using its
> `abort_handler`:
>
-> let extract_head = \lst larger_computation. lst
-> (\hd sofar continue_handler abort_handler. abort_handler hd)
-> junk
-> larger_computation
-> larger_computation
+> let extract_head = \lst larger_computation. lst
+> (\hd sofar continue_handler abort_handler. abort_handler hd)
+> junk
+> larger_computation
+> larger_computation
>
> 3. To extract tails efficiently, too, it'd be nice to fuse the apparatus
> developed in these v5 lists with the ideas from