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Another proof of $ζ(2)=\frac{π^{2}}{6}$ using double integrals. (English)
Am. Math. Mon. 120, No. 7, 642-645 (2013).
The author presents a proof of the Euler identity (known as the Basel problem) starting from a double integral that uses a rational function with the lowest degree among the functions used in different proofs of the same kind.
Reviewer: Cristinel Mortici (Târgovişte)
Classification: F65 I35 I55 I65