Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Split-quaternionic representation of SDYM SU(1,1) instantons in S^2 x
  S^2   This paper has been withdrawn by the authors due to some fatal errors that
cannot be mended. The authors apologize for any inconvenience.

18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys