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<head><title>_hyphen_.html  --  ACL2 Version 3.1</title></head>
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<h2>-</h2>macro for subtraction and negation
<pre>Major Section:  <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>

See <a href="BINARY-+.html">binary-+</a> for addition and see <a href="UNARY--.html">unary--</a> for negation.
<p>
Note that <code>-</code> represents subtraction as follows:

<pre>
(- x y)
</pre>

represents the same term as

<pre>
(+ x (- y))
</pre>

which is really

<pre>
(binary-+ x (unary-- y)).
</pre>

Also note that <code>-</code> represents arithmetic negation as follows:

<pre>
(- x)
</pre>

expands to

<pre>
(unary-- x).
</pre>


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