Polygamma

From specialfunctionswiki
Revision as of 02:14, 6 January 2016 by Tom (talk | contribs)
Jump to: navigation, search

The polygamma function of order $m$, $\psi^{(m)}(z)$, is defined by the formula $$\psi^{(m)}(z) = \dfrac{d^m}{dz^m} \log \Gamma(z),$$ where $\log$ denotes the logarithm and $\Gamma$ denotes the gamma function.

See Also

Digamma function
Trigamma function