Notes
The Sokhotski–Plemelj formula is a relation between generalized functions, that is, it is assumed that both sides of (20) are multiplied by a smooth function that is nonsingular in a neighborhood of the origin, and then integrated over a range of z containing the origin, and finally, the limit \(\epsilon \rightarrow 0\) is taken.
Paper El30 at http://www.math.dartmouth.edu/~euler/.
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Acknowledgments
The work is supported by the Ministry of Education and Science of the Russian Federation. The author thanks Professor Juan Arias de Reyna for indicating several interesting references, as well as an anonymous referee for constructive comments that helped to improve the presentation.
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Silagadze, Z.K. The Basel Problem: A Physicist’s Solution. Math Intelligencer 41, 14–18 (2019). https://doi.org/10.1007/s00283-019-09902-x
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DOI: https://doi.org/10.1007/s00283-019-09902-x