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<h4 class="subsection">D.11.2 <code>math</code> library predicates</h4>

<p>There is one binary predicate, <code>islessequal</code>, and several unary
<a name="index-predicates-768"></a>predicates, <code>isinfinite</code>, <code>isnan</code>, <code>isnormal</code>, <code>isubnormal</code>
and <code>iszero</code>.

   <p>The predicate <code>islessequal</code> takes a pair of floating point
numbers <code>(</code><var>x</var><code>,</code><var>y</var><code>)</code> as an argument, and returns
<code>nil</code> for a false result and <code>(nil,nil)</code> for a true result.

   <p>The unary predicates have the obvious interpretations as
classification functions, and should probably be used in preference to
comparison with constants in case the representations aren't unique.

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