Polygamma Function - GNU Scientific Library -- Reference Manual
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#### 7.28.3 Polygamma Function

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

> These routines compute the polygamma function \psi^{(n)}(x) for n >= 0, x > 0.

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