File: POSP.html

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<head><title>POSP.html  --  ACL2 Version 3.1</title></head>
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<h2>POSP</h2>a recognizer for the positive integers
<pre>Major Section:  <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
<p>
<code>(posp x)</code> is logically equivalent to <code>(not (zp x))</code> (see <a href="ZP.html">zp</a>) and also
  to <code>(and (natp x) (not (equal x 0)))</code>.  We recommend the file
  <code>books/ordinals/natp-posp</code> as a book for reasoning about <code>posp</code> and
  <code>natp</code>.  This book is included in <code>books/arithmetic/top</code> and
  <code>books/arithmetic/top-with-meta</code>.
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