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<h2>UNION-EQ</h2>union of two lists of symbols
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
<code>(Union-eq x y)</code> equals a list whose members
(see <a href="MEMBER-EQ.html">member-eq</a>) contains the members of <code>x</code> and the members
of <code>y</code>. More precisely, the resulting list is the same as one
would get by first deleting the members of <code>y</code> from <code>x</code>, and then
concatenating the result to the front of <code>y</code>.
<p>
The <a href="GUARD.html">guard</a> for <code>union-eq</code> requires both arguments to be true lists,
but in fact further requires the first list to contain only symbols,
as the function <code><a href="MEMBER-EQ.html">member-eq</a></code> is used to test membership (with
<code><a href="EQ.html">eq</a></code>). See <a href="UNION-EQUAL.html">union-equal</a>.
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