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add #occurs_free
author
jim
<jim@web>
Mon, 23 Mar 2015 19:33:53 +0000
(15:33 -0400)
committer
Linux User
<ikiwiki@localhost.members.linode.com>
Mon, 23 Mar 2015 19:33:53 +0000
(15:33 -0400)
exercises/assignment5_answers.mdwn
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Again, we've left some gaps. (The use of `type` for the first line in Haskell an
type lambda_term = Var of identifier | Abstract of identifier * lambda_term | App of lambda_term * lambda_term
+<a id="occurs_free"></a>
16. Write a function `occurs_free` that has the following type:
occurs_free : identifier -> lambda_term -> bool