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CLOSED SETS WITH THE KAKEYA PROPERTY

Part of: Real and complex geometry

Published online by Cambridge University Press:  23 September 2016

M. Csörnyei ,
K. Héra  and
M. Laczkovich
M. Csörnyei
Affiliation:
Department of Mathematics, University of Chicago, Chicago, IL 60637, U.S.A. email csornyei@math.uchicago.edu
K. Héra
Affiliation:
Department of Analysis, Institute of Mathematics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary email herakornelia@gmail.com
M. Laczkovich
Affiliation:
Department of Analysis, Institute of Mathematics, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117 Budapest, Hungary email laczk@cs.elte.hu
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Abstract

We say that a planar set $A$ has the Kakeya property if there exist two different positions of $A$ such that $A$ can be continuously moved from the first position to the second within a set of arbitrarily small area. We prove that if $A$ is closed and has the Kakeya property, then the union of the non-trivial connected components of $A$ can be covered by a null set which is either the union of parallel lines or the union of concentric circles. In particular, if $A$ is closed, connected and has the Kakeya property, then $A$ can be covered by a line or a circle.

MSC classification

Primary: 51M25: Length, area and volume
Type
Research Article
Information
Mathematika , Volume 63 , Issue 1 , 2017 , pp. 184 - 195
Copyright
Copyright © University College London 2016 

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References

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