Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of the determination of the surface impedance of an obstacle
  from the scattering amplitude   We prove a stability estimate of logarithmic type for the inverse problem
consisting in the determination of the surface impedance of an obstacle from
the scattering amplitude. We present a simple and direct proof which is
essentially based on an elliptic Carleman inequality.

19
The categories of this paper are: eess
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The categories of this paper are: econ
6
The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin