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SIMON-MARAIS 2019 A4

  • Paper A

Suppose x1,x2,x3,…x_1,x_2,x_3,\dotsc is a strictly decreasing sequence of positive real numbers such that the series x1+x2+x3+⋯x_1+x_2+x_3+\cdots diverges.

Is it necessary true that the series ∑n=2∞min⁡{xn,1nlog⁡(n)}\sum_{n=2}^{\infty}{\min \left\{ x_n,\frac{1}{n\log (n)}\right\} } diverges?

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