Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Functional A Posteriori Error Control for Conforming Mixed
  Approximations of Coercive Problems with Lower Order Terms   We derive functional a posteriori error equalities and constant free two
sided estimates for certain types of partial differential equations. The error
is measured in a combined norm which takes into account both the primal and
dual variable.

5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an