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Arnold said the following in a talk on teaching:

Jacobi noted, as mathematics' most fascinating property, that in it one and the same function controls both the presentations of a whole number as a sum of four squares and the real movement of a pendulum.

What's the meaning of this? Is the function he mentioned the theta function or something else? What's the relation with the real movement of a pendulum?

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    I was expecting to see something along the lines of "I'll be back!"...2012-12-04
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    @gnometorule what do you mean?2018-05-08
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    a series of lecture that you might be interested with: [Lectures on Selected Topics in Mathematical Physics: Elliptic Functions and Elliptic Integrals - Books - IOPscience](http://iopscience.iop.org/bookListInfo/schwalm-videos)2018-05-09

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