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Approximating elements of the middle third Cantor set with dyadic rationals

  • Simon Baker

摘要

Let C be the middle third Cantor set and μ be the \(\frac{\log\;2}{\log\;3}\) log 2 log 3 -dimensional Hausdorff measure restricted to C. In this paper we study approximations of elements of C by dyadic rationals. Our main result implies that for μ almost every xC we have \(\# \left\{{1 \le n \le N:\left| {x - {p \over {{2^n}}}} \right| \le {1 \over {{n^{0.01}} \cdot {2^n}}}\,{\rm{for}}\,{\rm{some}}\,p \in \mathbb{N}} \right\}\sim2\sum\limits_{n = 1}^N {{n^{- 0.01}}}.\) # { 1 n N : x p 2 n 1 n 0.01 2 n f o r s o m e p N } 2 n = 1 N n 0.01 . This improves upon a recent result of Allen, Chow, and Yu which gives a sub-logarithmic improvement over the trivial approximation rate.