Twisted inhomogeneous Diophantine approximation and badly approximable sets
Twisted inhomogeneous Diophantine approximation and badly approximable sets
复制标题
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
期刊:
影响因子:
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通讯作者:
Stephen Harrap
中科院分区:
文献类型:
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作者:
Stephen Harrap
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.
影响因子:
1.7
作者:
Badziahin D
通讯作者:
Badziahin D