Dirichlet eta function

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Notion

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Science and technology

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What Wikipedia says

In mathematics, in the area of analytic number theory, the Dirichlet eta function is defined by the following Dirichlet series, which converges for any complex number having real part greater than zero:

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

Image: Jan Homann, Public domain, via Wikimedia Commons.