Generating function for Bessel function is defined by(adsbygoogle = window.adsbygoogle || []).push({});

[tex]G(x,t)=e^{\frac{x}{2}(t-\frac{1}{t})}=\sum^{\infty}_{n=-\infty}J_n(x)t^n[/tex]

Why here we have Laurent series, even in case when functions are of real variables?

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# A Bessel function, Generating function

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