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Sapphorain (talk | contribs) Undid revision 1051737560 by 41.13.13.226 (talk) |
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:<math>\vartheta(x)=\sum_{p\le x} \log p,</math>
:<math> \psi(x) = \sum_{k\in N}\sum_{p^k\le x} \log p.</math>
The Chebyshev function ''ψ''(''x'') is the summation function of the von Mangoldt function just below.
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