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The polygamma functions of order *n* are defined by

\psi^{(n)}(x) = (d/dx)^n \psi(x) = (d/dx)^{n+1} \log(\Gamma(x))

where *\psi(x) = \Gamma'(x)/\Gamma(x)* is known as the digamma function.
These functions are declared in the header file `gsl_sf_psi.h`.

• Digamma Function: | ||

• Trigamma Function: | ||

• Polygamma Function: |