Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The analytical solution of the problem on plasma oscillations in
  half-space with diffusion boundary conditions   The boundary problem about behaviour (oscillations) of the electronic plasmas
with arbitrary degree of degeneration of electronic gas in half-space with
diffusion boundary conditions is analytically solved. The kinetic equation of
Vlasov - Boltzmann with integral of collisions of type BGK (Bhatnagar, Gross,
Krook) and Maxwell equation for electric field are applied. Distribution
function for electrons and electric field in plasma in the form of expansion
under eigen solutions of the initial system of equations are received.
Coefficients of these expansions are found by means of the boundary conditions.

24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph