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<h2 class="chapter">4 Mathematical Functions</h2>
<a name="index-elementary-functions"></a>
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<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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