File: BOOLEANP.html

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

<code>(Booleanp x)</code> is <code>t</code> if <code>x</code> is <code>t</code> or <code>nil</code>, and is <code>nil</code> otherwise.
<p>
See <a href="GENERALIZED-BOOLEANS.html">generalized-booleans</a> for a discussion of a potential
soundness problem for ACL2 related to the question:  Which Common
Lisp functions are known to return Boolean values?
<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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