Chebyshev function

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What Wikipedia says

In mathematics, the Chebyshev function is either a scalarising function (Tchebycheff function) or one of two related functions. The first Chebyshev function ϑ(x) or θ(x) is given by

Excerpt from the Wikipedia article “Chebyshev function”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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