Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Reversed gravitational acceleration...", arXiv:1102.2870v2   Hilbert's 1917 discovery of reversed gravitational acceleration is discussed,
and the connection to arXiv:1102.2870v2 [gr-qc] is explained.

4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
19
The categories of this paper are: eess