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Von Mangoldt function : ウィキペディア英語版
Von Mangoldt function
In mathematics, the von Mangoldt function is an arithmetic function named after German mathematician Hans von Mangoldt. It is an example of an important arithmetic function that is neither multiplicative nor additive.
==Definition==
The von Mangoldt function, denoted by , is defined as
:\Lambda(n) = \begin \log p & \textn=p^k \text p \text k \ge 1, \\ 0 & \text \end
The values of for the first nine positive numbers are
:0 , \log 2 , \log 3 , \log 2 , \log 5 , 0 , \log 7 , \log 2 , \log 3,
which is related to .
The summatory von Mangoldt function, , also known as the Chebyshev function, is defined as
:\psi(x) = \sum_ \Lambda(n).
von Mangoldt provided a rigorous proof of an explicit formula for involving a sum over the non-trivial zeros of the Riemann zeta function. This was an important part of the first proof of the prime number theorem.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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