mdesc:ga29ef934c00306490de837b4746b4e14d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns true if x holds a NaN (not a number) representation in the underlying implementation's set of floating point representations.  <a href="a00143.html#ga29ef934c00306490de837b4746b4e14d">More...</a><br /></td></tr>
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