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This article is cited in 6 scientific papers (total in 6 papers)
Partition of Three-Dimensional Sets into Five Parts of Smaller Diameter
A. B. Kupavskii, A. M. Raigorodskii M. V. Lomonosov Moscow State University
Abstract:
The classical Borsuk problem on partitioning sets into pieces of smaller diameter is considered. A new upper bound for
$$
d_5^3=\sup_{\Phi\subset\mathbb R^3,\operatorname{diam}\Phi=1}\inf\{x\ge0:\Phi=\Phi_1\cup\Phi_2\cup\dots\cup\Phi_5,\operatorname{diam}\Phi_i\le x\}
$$
is given, which improves the previous bound obtained by Lassak in 1982.
Keywords:
Borsuk's problem, partition of 3D sets, diameter of a set, Lassak's bound, Gale's conjecture, Jung's ball, Helly's theorem, isometry.
Received: 04.06.2008
Citation:
A. B. Kupavskii, A. M. Raigorodskii, “Partition of Three-Dimensional Sets into Five Parts of Smaller Diameter”, Mat. Zametki, 87:2 (2010), 233–245; Math. Notes, 87:2 (2010), 218–229
Linking options:
https://www.mathnet.ru/eng/mzm5188https://doi.org/10.4213/mzm5188 https://www.mathnet.ru/eng/mzm/v87/i2/p233
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