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arXiv 1902.09034math.NT
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关于形式幂级数域上的齐次和非齐次丢番图逼近

On homogeneous and inhomogeneous Diophantine approximation over the fields of formal power series

Yann Bugeaud, Zhenliang Zhang

摘要:

在幂级数域上证明了在实数域上得到的几个丢番图逼近结果的类似结果。特别地,我们建立了矩阵的Kronecker定理的幂级数模拟,并给出了它的一个定量形式,它也可以看作是一致逼近与非齐次逼近之间的一个转换不等式.特别注意的是致力于一维的情况下。也就是说,我们给出了无理幂级数$α$的一个充要条件,该条件保证了对于某些正的$\eps$,集合$$ \liminf_{Q \in \mathbb{F}_q[z], \,\, °Q \to \infty} \| Q \| \cdot |\langle Q α- θ\rangle| \geq \eps $$具有满豪斯多夫维数.

英文摘要:

We prove over fields of power series the analogues of several Diophantine approximation results obtained over the field of real numbers. In particular we establish the power series analogue of Kronecker's theorem for matrices, together with a quantitative form of it, which can also be seen as a transference inequality between uniform approximation and inhomogeneous approximation. Special attention is devoted to the one dimensional case. Namely, we give a necessary and sufficient condition on an irrational power series $α$ which ensures that, for some positive $\eps$, the set $$ \liminf_{Q \in \mathbb{F}_q[z], \,\, °Q \to \infty} \| Q \| \cdot |\langle Q α- θ\rangle| \geq \eps $$ has full Hausdorff dimension.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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