Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On partial regularity for the $3D$ non-stationary Hall
  magnetohydrodynamics equations on the plane   We study partial regularity of weak solutions of the 3D valued non-stationary
Hall magnetohydrodynamics equations on $ \Bbb R^2$. In particular we prove the
existence of a weak solution whose set of possible singularities has the
space-time Hausdorff dimension at most two.

11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex