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Polygamma Function

Function: double gsl_sf_psi_n (int m, double x)
Function: int gsl_sf_psi_n_e (int m, double x, gsl_sf_result * result)
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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