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arXiv 2104.03405math.NT
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两个无理数的有理逼近

Rational approximations to two irrational numbers

Nikita Shulga

摘要:

对于实$ξ$,我们考虑非理性测度函数$ψ_ξ(t) = \min_{1\leqslant q \leqslant t, q\in\mathbb{Z}} || qξ||$,其中$||\cdot||$ -到最近整数的距离。我们证明了在$α\pmβ\notin\mathbb{Z}$的情况下,存在任意大的$t$值,且$$\Bigl | \frac{1}{ψ_α(t)} - \frac{1}{ψ_β(t)} \Bigl | \geqslant \sqrt5\left(1-\sqrt{\frac{\sqrt5-1}{2}}\right)t.$$右边的常数是最优的。

英文摘要:

For real $ξ$ we consider the irrationality measure function $ψ_ξ(t) = \min_{1\leqslant q \leqslant t, q\in\mathbb{Z}} || qξ||$, where $||\cdot||$ - distance to the nearest integer. We prove that in the case $α\pmβ\notin\mathbb{Z}$ there exist arbitrary large values of $t$ with $$\Bigl | \frac{1}{ψ_α(t)} - \frac{1}{ψ_β(t)} \Bigl | \geqslant \sqrt5\left(1-\sqrt{\frac{\sqrt5-1}{2}}\right)t.$$ The constant on the right-hand side is optimal.

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