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arXiv math/0605004math.NT
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平面曲线上同时和乘性丢番图逼近的收敛性结果

Convergence results for simultaneous and multiplicative Diophantine approximation on planar curves

Dzmitry Badziahin, Jason Levesley

摘要:

设$\mathcal{C}$为非退化平面曲线。我们表明,曲线的Khintchine型收敛的情况下,同时逼近两个独立的逼近功能,即如果一定的总和收敛,然后在曲线上的所有点$(x,y)$,同时满足不等式$\| q x \| < ψ_1(q)$和$\| qy \| < ψ_2(q)$无限往往导致措施0。这就完成了勒贝格情形的度量理论。进一步,对于乘法逼近$\| qx \| \| q y \| < ψ(q)$,我们建立了一类曲线的Hausdorff测度收敛结果,这是在这一特殊的构造中,对于一般流形的第一个这样的结果.

英文摘要:

Let $\mathcal{C}$ be a non-degenerate planar curve. We show that the curve is of Khintchine-type for convergence in the case of simultaneous approximation with two independent approximation functions; that is if a certain sum converges then the set of all points $(x,y)$ on the curve which satisfy simultaneously the inequalities $\| q x \| < ψ_1(q)$ and $\| qy \| < ψ_2(q)$ infinitely often has induced measure 0. This completes the metric theory for the Lebesgue case. Further, for the cae of multiplicative approximation $\| qx \| \| q y \| < ψ(q)$, we establish a Hausdorff measure convergence result for the same class of curves, the first such result for a general class of manifolds in this particular setup.

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