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<head><title>REMOVE1.html -- ACL2 Version 3.1</title></head>
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<h2>REMOVE1</h2>remove first occurrences, testing using <code><a href="EQL.html">eql</a></code>
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
<code>(remove1 x l)</code> is <code>l</code> if <code>x</code> is not a member of <code>l</code>, else is the
result of removing the first occurrence of <code>x</code> from <code>l</code>.
<p>
The <a href="GUARD.html">guard</a> for <code>(remove1 x l)</code> requires <code>l</code> to be a true list and
moreover, either <code>x</code> is <code><a href="EQLABLEP.html">eqlablep</a></code> or all elements of <code>l</code> are
<code><a href="EQLABLEP.html">eqlablep</a></code>.<p>
Also see <a href="REMOVE.html">remove</a>, see <a href="REMOVE1-EQUAL.html">remove1-equal</a>, and see <a href="REMOVE1-EQ.html">remove1-eq</a>.
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