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<head><title>CAR.html -- ACL2 Version 3.1</title></head>
<body text=#000000 bgcolor="#FFFFFF">
<h2>CAR</h2>returns the first element of a non-empty list, else <code>nil</code>
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
Completion Axiom:
<pre>
(equal (car x)
(cond
((consp x)
(car x))
(t nil)))
</pre>
<p>
<a href="GUARD.html">Guard</a>:
<pre>
(or (consp x) (equal x nil))
</pre>
Notice that in the ACL2 logic, <code>car</code> returns <code>nil</code> for every <a href="ATOM.html">atom</a>.
<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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