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<h4 class="subsection">D.14.4 <code>mpfr</code> binary predicates</h4>

<p>These predicates take a pair of <code>mpfr</code> numbers
<code>(</code><var>x</var><code>,</code><var>y</var><code>)</code> as arguments and perform a logical operation. 
If the result is true, they return <code>(nil,nil)</code>, and if it's
false, they return <code>nil</code>.

     <ul>
<li><code>equal_p</code>
<li><code>unequal_abs</code>
<li><code>greater_p</code>
<li><code>greaterequal_p</code>
<li><code>less_p</code>
<li><code>lessequal_p</code>
<li><code>lessgreater_p</code>
</ul>

   <p>The name of the function <code>unequal_abs</code>, for comparing absolute
values, has been changed from <code>mpfr_cmpabs</code> to avoid confusion
with the virtual machine's <code>compare</code> combinator. The
<code>compare</code> combinator returns a <code>(nil,nil)</code> result (i.e.,
true) if the
<a name="index-compare-combinator-796"></a>operands are equal and a <code>nil</code> result if they're unequal,
opposite from <code>unequal_abs</code>.

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