25 September 2025

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23 October 2023

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20 August 2008

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29 December 2007

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• curprev 09:5709:57, 29 December 2007 Boy Soprano II talk contribs 1,955 bytes +1,955 New page: == Problem == Let <math>x_1, x_2, \dotsc, x_n</math> be arbitrary real numbers. Prove the inequality <cmath> \frac{x_1}{1+x_1^2} + \frac{x_2}{1+x_1^2 + x_2^2} + \dotsb + \frac{x_n}{1+ x_...