Obstacles for splitting multidimensional necklaces
Abstract
The well-known "necklace splitting theorem" of Alon asserts that every -colored necklace can be fairly split into parts using at most cuts, provided . In a joint paper with Alon et al. we studied a kind of opposite question. Namely, for which values of and there is a measurable -coloring of the real line such that no interval has a fair splitting into parts with at most cuts? We proved that is a sufficient condition (while is necessary). We generalize this result to Euclidean spaces of arbitrary dimension , and to arbitrary number of parts . We prove that if , then there is a measurable -coloring of such that no axis-aligned cube has a fair -splitting using at most axis-aligned hyperplane cuts. Our bound is of the same order as a necessary condition implied by a theorem of Alon. Moreover for we get exactly the result of of Alon et al. Additionally, we prove that if a stronger inequality is satisfied, then there is a measurable -coloring of with no axis-aligned cube having a fair -splitting using at most arbitrary hyperplane cuts. The proofs are based on the topological Baire category theorem and use algebraic independence over suitably chosen fields.
Keywords
Cite
@article{arxiv.1304.5390,
title = {Obstacles for splitting multidimensional necklaces},
author = {Michał Lasoń},
journal= {arXiv preprint arXiv:1304.5390},
year = {2016}
}
Comments
final version, 14 pages