Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Propagation of Polarization in Elastodynamics with Residual Stress and
  Travel Times   We show that knowing the Dirichlet-to-Neumann map (DN) associated to the
equations of elastodynamics with residual stress we can determine the lens
relations of presssure and shear waves. We derive several consequences of this
for the inverse problem of determining the residual stress and the Lam\'e
parameters from the DN map.

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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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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: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph