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<title>GNU Scientific Library &ndash; Reference Manual: Mathematical Functions</title>

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<a name="Mathematical-Functions"></a>
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<p>
Next: <a href="Complex-Numbers.html#Complex-Numbers" accesskey="n" rel="next">Complex Numbers</a>, Previous: <a href="Error-Handling.html#Error-Handling" accesskey="p" rel="previous">Error Handling</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Mathematical-Functions-1"></a>
<h2 class="chapter">4 Mathematical Functions</h2>
<a name="index-elementary-functions"></a>
<a name="index-mathematical-functions_002c-elementary"></a>

<p>This chapter describes basic mathematical functions.  Some of these
functions are present in system libraries, but the alternative versions
given here can be used as a substitute when the system functions are not
available.
</p>
<p>The functions and macros described in this chapter are defined in the
header file <samp>gsl_math.h</samp>.
</p>
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<tr><td align="left" valign="top">&bull; <a href="Mathematical-Constants.html#Mathematical-Constants" accesskey="1">Mathematical Constants</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Infinities-and-Not_002da_002dnumber.html#Infinities-and-Not_002da_002dnumber" accesskey="2">Infinities and Not-a-number</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Elementary-Functions.html#Elementary-Functions" accesskey="3">Elementary Functions</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Small-integer-powers.html#Small-integer-powers" accesskey="4">Small integer powers</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Testing-the-Sign-of-Numbers.html#Testing-the-Sign-of-Numbers" accesskey="5">Testing the Sign of Numbers</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Testing-for-Odd-and-Even-Numbers.html#Testing-for-Odd-and-Even-Numbers" accesskey="6">Testing for Odd and Even Numbers</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Maximum-and-Minimum-functions.html#Maximum-and-Minimum-functions" accesskey="7">Maximum and Minimum functions</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Approximate-Comparison-of-Floating-Point-Numbers.html#Approximate-Comparison-of-Floating-Point-Numbers" accesskey="8">Approximate Comparison of Floating Point Numbers</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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