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<head><title>ENDP.html -- ACL2 Version 3.1</title></head>
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<h2>ENDP</h2>recognizer for empty lists
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
In the ACL2 logic, <code>(endp x)</code> is the same as <code>(atom x)</code>.
See <a href="ATOM.html">atom</a>.
<p>
Unlike <code><a href="ATOM.html">atom</a></code>, the <a href="GUARD.html">guard</a> for <code>endp</code> requires that <code>x</code> is a
<code><a href="CONS.html">cons</a></code> pair or is <code>nil</code>. Thus, <code>endp</code> is typically used as a
termination test for functions that recur on a <code><a href="TRUE-LISTP.html">true-listp</a></code>
argument. See <a href="GUARD.html">guard</a> for general information about <a href="GUARD.html">guard</a>s.<p>
<code>Endp</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>
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