Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classifications of two-dimensional Jordan algebras over the
  algebraically closed fields and $\mathbb{R}$   The classification, up to isomorphism, of two-dimensional (not necessarily
commutative) Jordan algebras over algebraically closed fields and $\mathbb{R}$
is presented in terms of their matrices of structure constants.

12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-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
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph