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Mar 23, 2021 at 11:22 comment added Dima Pasechnik See my comment to the question - it's earlier than that, due to N.Sonin, by at least 4 years (N.Sonin died in 1915).
Apr 3, 2020 at 21:46 comment added Francois Ziegler Thank you. But, unless I missed it, Weyl’s paper only considers the cases n = 2, 3 done before by Parseval and Poisson, no?
Apr 3, 2020 at 21:15 review First posts
Apr 3, 2020 at 21:35
Apr 3, 2020 at 21:10 history answered Josh Albert CC BY-SA 4.0