Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A posteriori error estimates for a finite element approximation of
  transmission problems with sign changing coefficients   We perform the a posteriori error analysis of residual type of a transmission
problem with sign changing coefficients. According to [6] if the contrast is
large enough, the continuous problem can be transformed into a coercive one. We
further show that a similar property holds for the discrete problem for any
regular meshes, extending the framework from [6]. The reliability and
efficiency of the proposed estimator is confirmed by some numerical tests.

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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an