Bessel function

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What Wikipedia says

Bessel functions are a class of special functions that commonly appear in problems involving wave motion, heat conduction, and other physical phenomena with circular or cylindrical symmetry. They are named after the German astronomer and mathematician Friedrich Bessel, who studied them systematically in 1824.

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