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Undid revision 1211972909 by Maximilian Janisch (talk)Reverted unexplained edit: unnecessary. Chebyshev function is already linked, as are the other functions similarly. |
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<math display="block">\Pi(x) = \sum_{p^k\le x}\frac{1}{k}.</math>
'''[[Chebyshev function|''θ''(''x'')]]''' and '''''ψ''(''x'')''', the
<math display="block">\vartheta(x)=\sum_{p\le x} \log p,</math>
<math display="block"> \psi(x) = \sum_{p^k\le x} \log p.</math>
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