Twisted inhomogeneous Diophantine approximation and badly approximable sets

Twisted inhomogeneous Diophantine approximation and badly approximable sets
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扭曲非齐次丢番图近似和差近似集

DOI:
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发表时间:
2010
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影响因子:
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通讯作者:
Stephen Harrap
Stephen Harrap
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作者:
Stephen Harrap

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设Bad(i,j)表示(i,j)-差可逼近对的集合,对任意实数对i,j,i+j=1,jgeq0。也就是说,Bad(i,j)由R^2中的无理向量x:=(x_1,x_2)组成,其中存在一个正常数c(X)使得对N中的所有q都有max{||qx_1||^(-i),||qx_2||^(-j)}>c(X)/q。此外,还证明了当x选自集合Bad(i,j)时,Bad(i,j)的非齐次模拟Bad^x(i,j)具有全Hausdorff维2。主要结果自然地推广了Kurzweil的i=j=1/2工作。
For any real pair i, j geq 0 with i+j=1 let Bad(i, j) denote the set of (i, j)-badly approximable pairs. That is, Bad(i, j) consists of irrational vectors x:=(x_1, x_2) in R^2 for which there exists a positive constant c(x) such that max {||qx_1||^(-i), ||qx_2||^(-j)} > c(x)/q for all q in N. A new characterization of the set Bad(i, j) in terms of `well-approximable' vectors in the area of 'twisted' inhomogeneous Diophantine approximation is established. In addition, it is shown that Bad^x(i, j), the `twisted' inhomogeneous analogue of Bad(i, j), has full Hausdorff dimension 2 when x is chosen from the set Bad(i, j). The main results naturally generalise the i=j=1/2 work of Kurzweil.
DOI: 10.1016/j.aim.2011.06.041
发表时间: 2011
影响因子: 1.7
作者:
Badziahin D
通讯作者: Badziahin D