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Hirschhorn, Michael D. A simple proof that \(\zeta (2) = \frac {\pi^{2}}{6}\). (English) Zbl 1291.11113 Math. Intell. 33, No. 3, 81-82 (2011). MSC: 11M06 11J72 PDF BibTeX XML Cite \textit{M. D. Hirschhorn}, Math. Intell. 33, No. 3, 81--82 (2011; Zbl 1291.11113) Full Text: DOI