Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On heteroclinic separators of magnetic fields in electrically conducting
  fluids   In this paper we partly solve the problem of existence of separators of a
magnetic field in plasma. We single out in plasma a 3-body with a boundary in
which the movement of plasma is of special kind which we call an (a-d)-motion.
We prove that if the body is the 3-annulus or the "fat" orientable surface with
two holes the magnetic field necessarily have a heteroclinic separator. The
statement of the problem and the suggested method for its solution lead to some
theoretical problems from Dynamical Systems Theory which are of interest of
their own.

8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th