Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unconditionally stable schemes for non-stationary convection-diffusion
  equations   Convection-diffusion problem are the base for continuum mechanics. The main
features of these problems are associated with an indefinite operator the
problem. In this work we construct unconditionally stable scheme for
non-stationary convection-diffusion equations, which are based on use of new
variables. Also, we consider these equations in the form of
convection-diffusion-reaction and construct unconditionally stable schemes when
explicit-implicit approximations are used with splitting of the reaction
operator.

21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
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
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th