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Jack D'Aurizio earned this badge 2 times
dec 11 at 10:58
trouble with this integral
nov 23 at 5:59
proof of $\sum\nolimits_{i = 1}^{n } {\prod\nolimits_{\substack{j = 1\\j \ne i}}^{n } {\frac{{x_i }}{{x_i - x_j }}} } = 1$

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