When I was scanning the materials of Bessel function, I found that when the variable is:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

xe^{\frac{3\pi}{4}i}

[/tex]

the Bessel function is called Kelvin function. Then what is the practical appliance of this function?

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# What is the usage of Kelvin function?

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