Hankel transform

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What Wikipedia says

In mathematics, the Hankel transform expresses any given function f(r) as the weighted sum of an infinite number of Bessel functions of the first kind Jν(kr). The Bessel functions in the sum are all of the same order ν, but differ in a scaling factor k along the r axis.

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