The polygamma functions of order @math{m} defined by
@math{\psi^{(m)}(x) = (d/dx)^m \psi(x) = (d/dx)^{m+1} \log(\Gamma(x))},
where @math{\psi(x) = \Gamma'(x)/\Gamma(x)} is known as the digamma function.
These functions are declared in the header file ``gsl_sf_psi.h'`.

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