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- Function: double gsl_sf_psi_n (int m, double x)
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- Function: int gsl_sf_psi_n_e (int m, double x, gsl_sf_result * result)
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These routines compute the polygamma function @c{$\psi^{(m)}(x)$}
@math{\psi^{(m)}(x)} for
@math{m >= 0}, @math{x > 0}.
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