Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of backward Euler/Spectral discretization for an evolutionary
  mass and heat transfer in porous medium   This paper presents the unsteady Darcy's equations coupled with two nonlinear
reaction-diffusion equations, namely this system describes the mass
concentration and heat transfer in porous media. The existence and uniqueness
of the solution are established for both the variational formulation problem
and for its discrete one obtained using spectral discretization. Optimal a
priori estimates are given using the Brezzi-Rappaz-Raviart theorem. We conclude
by some numerical tests which are in agreement with our theoretical results.

7
The categories of this paper are: hep-th
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The categories of this paper are: stat
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an