My Calculus 2 teacher's lecture slides say:(adsbygoogle = window.adsbygoogle || []).push({});

Many of the functions that arise in mathematical physics and chemistry, such as Bessel functions, are defined as sums of series.

I was just wondering how this was different from the basic functions that we've already worked with. Are they not defined as sums of series as well? If not, can they be?

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# I Defining Functions as Sums of Series

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