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arXiv 0910.4448math.NT
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无理性指数与具有预定增长的有理逼近

Irrationality exponent and rational approximations with prescribed growth

Stéphane Fischler, Tanguy Rivoal

摘要:

设$ξ$为实数无理数。我们感兴趣的是1和$ξ$的线性型序列,其整数系数趋于0。是否存在这样一个序列,使得线性型很小(具有给定的下降率),并且系数具有给定的增长率?如果这些速率基本上是几何的,则这样的序列存在的必要条件是线性型不太小,该条件可以使用$ξ$的无理性指数精确地表示。我们证明了这个条件实际上是充分的,即使是任意的增长率和减少率。我们还提出了一些意见,并提出一些问题,多元推广连接到Fischler-Zudilin的新证明Nesterenko的线性独立性标准。

英文摘要:

Let $ξ$ be a real irrational number. We are interested in sequences of linear forms in 1 and $ξ$, with integer coefficients, which tend to 0. Does such a sequence exist such that the linear forms are small (with given rate of decrease) and the coefficients have some given rate of growth? If these rates are essentially geometric, a necessary condition for such a sequence to exist is that the linear forms are not too small, a condition which can be expressed precisely using the irrationality exponent of $ξ$. We prove that this condition is actually sufficient, even for arbitrary rates of growth and decrease. We also make some remarks and ask some questions about multivariate generalizations connected to Fischler-Zudilin's new proof of Nesterenko's linear independence criterion.

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