Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Einstein Bianchi equations with sources   In this article, dedicated to one of the best specialist of the FOSH systems,
we couple the Bianchi equations with the equations satisfied by the dynamical
acceleration of a charged fluid and the derivatives of the associated Maxwell
field.

9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol