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<head><title>UNION-THEORIES.html -- ACL2 Version 3.1</title></head>
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<h2>UNION-THEORIES</h2>union two <a href="THEORIES.html">theories</a>
<pre>Major Section: <a href="THEORIES.html">THEORIES</a>
</pre><p>
<pre>
Example:
(union-theories (current-theory 'lemma3)
(theory 'arith-patch))
<p>
General Form:
(union-theories th1 th2)
</pre>
where <code>th1</code> and <code>th2</code> are theories (see <a href="THEORIES.html">theories</a>). To each of
the arguments there corresponds a runic theory. This function
returns the union of those two runic <a href="THEORIES.html">theories</a>, represented as a list
and ordered chronologically.<p>
This ``function'' is actually a macro that expands to a term
mentioning the single free variable <code><a href="WORLD.html">world</a></code>. When theory expressions
are evaluated by <code><a href="IN-THEORY.html">in-theory</a></code> or the <code>:</code><code><a href="IN-THEORY.html">in-theory</a></code> hint, <code><a href="WORLD.html">world</a></code> is bound to
the current ACL2 <a href="WORLD.html">world</a>.
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