Notes
Euler himself is thought to have given at least four different proofs in his lifetime [46].
A recent discussion of this seminal paper has been given by Ryotaro Harada [32].
Only much later, in 2015, Kunle Adegoke showed that every linear Euler sum can be decomposed into a linear combination of Tornheim’s harmonic double series [1].
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Stewart, S.M. In The Shadow of Euler’s Greatness: Adventures in the Rediscovery of an Intriguing Sum. Math Intelligencer 43, 82–91 (2021). https://doi.org/10.1007/s00283-021-10106-5
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DOI: https://doi.org/10.1007/s00283-021-10106-5