Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some old and new problems in combinatorial geometry I: Around Borsuk's
  problem   Borsuk asked in 1933 if every set of diameter 1 in $R^d$ can be covered by
$d+1$ sets of smaller diameter. In 1993, a negative solution, based on a
theorem by Frankl and Wilson, was given by Kahn and Kalai. In this paper I will
present questions related to Borsuk's problem.

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The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg