English

On the Hadwiger numbers of starlike disks

Metric Geometry 2011-05-24 v3

Abstract

The Hadwiger number H(J)H(J) of a topological disk JJ in 2\Re^2 is the maximal number of pairwise nonoverlapping translates of JJ that touch JJ. It is well known that for a convex disk, this number is six or eight. A conjecture of A. Bezdek., K. and W. Kuperberg says that the Hadwiger number of a starlike disk is at most eight. A. Bezdek proved that this number is at most seventy five for any starlike disk. In this note, we prove that the Hadwiger number of a starlike disk is at most thirty five. Furthermore, we show that the Hadwiger number of a topological disk JJ such that (\convJ)J(\conv J) \setminus J is connected, is six or eight.

Keywords

Cite

@article{arxiv.1002.3918,
  title  = {On the Hadwiger numbers of starlike disks},
  author = {Zsolt Langi},
  journal= {arXiv preprint arXiv:1002.3918},
  year   = {2011}
}

Comments

13 pages, 8 figures