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<h4 class="subsection">D.14.5 <code>mpfr</code> unary predicates</h4>

<p>Each of these predicates takes an <code>mpfr</code> number as an argument
and performs a logical operation. If the result is true, it returns
<code>(nil,nil)</code>, and otherwise it returns <code>nil</code>.

     <ul>
<li><code>nan_p</code>
<li><code>inf_p</code>
<li><code>number_p</code>
<li><code>zero_p</code>
<li><code>integer_p</code>
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