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Feb 17, 2021 at 14:37 comment added Shimrod Thank you for your answer, I downloaded the book and will look into it. However, this does not answer my question; what I had in mind was rather a proof along the lines of the proof of two/four square theorem using the series $\sum q^{n^2}$.
Feb 16, 2021 at 0:59 history edited Will Jagy CC BY-SA 4.0
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Feb 16, 2021 at 0:52 history answered Will Jagy CC BY-SA 4.0