Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A natural connection on some classes of almost contact manifolds with
  B-metric   Almost contact manifolds with B-metric are considered. A special linear
connection is introduced, which preserves the almost contact B-metric structure
on these manifolds. This connection is investigated on some classes of the
considered manifolds.

32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess