Euler's constant

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Notion

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Science and technology

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What Wikipedia says

Euler's constant (sometimes called the Euler–Mascheroni constant) is a mathematical constant, usually denoted by the lowercase Greek letter gamma (γ), defined as the limiting difference between the harmonic series and the natural logarithm, denoted here by log:

Excerpt from the Wikipedia article “Euler's constant”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: William Demchick (Kiwi128), CC BY 3.0, via Wikimedia Commons.