Järvenpää, Esa; Järvenpää, Maarit; MacManus, Paul and O'Neil, Toby C.
(2003).
*Nonlinearity*, 16(3) pp. 803–818.

DOI (Digital Object Identifier) Link: | http://dx.doi.org/10.1088/0951-7715/16/3/302 |
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## Abstract

We study the visible parts of subsets of n-dimensional Euclidean space: a point a of a compact set A is visible from an affine subspace K of Rn, if the line segment joining PK(a) to a only intersects A at a (here PK denotes projection onto K). The set of all such points visible from a given subspace K is called the visible part of A from K. We prove that if the Hausdorff dimension of a compact set is at most n−1, then the Hausdorff dimension of a visible part is almost surely equal to the Hausdorff dimension of the set. On the other hand, provided that the set has Hausdorff dimension larger than n − 1, we have the almost sure lower bound n − 1 for the Hausdorff dimensions of visible parts. We also investigate some examples of planar sets with Hausdorff dimension bigger than 1. In particular,we prove that for quasi-circles in the plane all visible parts have Hausdorff dimension equal to 1.

Item Type: | Journal Article |
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ISSN: | 1361-6544 |

Extra Information: | Some of the symbols may not have transferred correctly into this bibliographic record and/or abstract. |

Keywords: | Hausdorff dimension; visible sets |

Academic Unit/Department: | Mathematics, Computing and Technology > Mathematics and Statistics Mathematics, Computing and Technology |

Item ID: | 2138 |

Depositing User: | Toby O'Neil |

Date Deposited: | 13 Nov 2006 |

Last Modified: | 14 Jan 2016 15:46 |

URI: | http://oro.open.ac.uk/id/eprint/2138 |

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