Recent work connected with the Kakeya problem

@inproceedings{Wolff2007RecentWC,
  title={Recent work connected with the Kakeya problem},
  author={Thomas H. Wolff},
  year={2007}
}
where Sn−1 is the unit sphere in R. This paper will be mainly concerned with the following issue, which is still poorly understood: what metric restrictions does the property (1) put on the set E? The original Kakeya problem was essentially whether a Kakeya set as defined above must have positive measure, and as is well-known, a counterexample was given by Besicovitch in 1920. A current form of the problem is as follows: 

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