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On uniform approximation to real numbers (1512.00780v4)

Published 2 Dec 2015 in math.NT

Abstract: Let $n \ge 2$ be an integer and $\xi$ a transcendental real number. We establish several new relations between the values at $\xi$ of the exponents of Diophantine approximation $w_n, w_{n}{\ast}, \hat{w}{n}$, and $\hat{w}{n}{\ast}$. Combining our results with recent estimates by Schmidt and Summerer allows us to refine the inequality $\hat{w}_{n}(\xi) \le 2n-1$ proved by Davenport and Schmidt in 1969.

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