Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kramer--Neugebauer Transformation for Einstein--Maxwell--Dilaton--Axion
  Theory   The Kramer--Neugebauer--like transformation is constructed for the stationary
axisymmetric D=4 Einstein--Maxwell--dilaton--axion system. This transformation
directly maps the dualized sigma--model equations of the theory into the
nondualized ones. Also the new chiral $4 \times 4$ matrix representation of the
problem is presented.

17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
2
The categories of this paper are: math