File: NULL.html

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<head><title>NULL.html  --  ACL2 Version 3.1</title></head>
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<h2>NULL</h2>recognizer for the empty list
<pre>Major Section:  <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>

<code>Null</code> is the function that checks whether its argument is <code>nil</code>.
For recursive definitions it is often preferable to test for the end
of a list using <code><a href="ENDP.html">endp</a></code> instead of <code>null</code>; see <a href="ENDP.html">endp</a>.
<p>
<code>Null</code> is a Common Lisp function.  See any Common Lisp
documentation for more information.
<br><br><br><a href="acl2-doc.html"><img src="llogo.gif"></a> <a href="acl2-doc-index.html"><img src="index.gif"></a>
</body>
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