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4 Mathematical Functions
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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.

The functions and macros described in this chapter are defined in the
header file ‘gsl_math.h’.

* Mathematical Constants
* Infinities and Not-a-number
* Elementary Functions
* Small integer powers
* Testing the Sign of Numbers
* Testing for Odd and Even Numbers
* Maximum and Minimum functions
* Approximate Comparison of Floating Point Numbers

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