Trigamma function

In mathematics, the trigamma function, denoted $\psi_1(z)$ , is the second of the polygamma functions, and is defined by

It follows from this definition that

where $\psi(z)$ is the digamma function. It may also be defined as the sum of the series

making it a special case of the Hurwitz zeta function

单词	Trigamma function
释义	Trigamma function 英语百科 Trigamma function In mathematics, the trigamma function, denoted $\psi_1(z)$ , is the second of the polygamma functions, and is defined by It follows from this definition that where $\psi(z)$ is the digamma function. It may also be defined as the sum of the series making it a special case of the Hurwitz zeta function
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