Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Local criteria for the existence of an accelerated frame of reference   A local criteria for the existence of an accelerated frame of reference is
found. An accelerated frame of reference could exist in all regions where a
non-null (non-isotropic) vector field does not degenerate in a null (isotropic)
vector field.

22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys