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<head><title>UNARY--.html -- ACL2 Version 3.1</title></head>
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<h2>UNARY--</h2>arithmetic negation function
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
Completion Axiom:
<pre>
(equal (unary-- x)
(if (acl2-numberp x)
(unary-- x)
0))
</pre>
<p>
<a href="GUARD.html">Guard</a> for <code>(unary-- x)</code>:
<pre>
(acl2-numberp x)
</pre>
Notice that like all arithmetic functions, <code>unary--</code> treats
non-numeric inputs as <code>0</code>.<p>
Calls of the macro <code><a href="_hyphen_.html">-</a></code> on one argument expand to calls of
<code>unary--</code>; see <a href="_hyphen_.html">-</a>.
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