Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Subsonic Free Surface Waves in Linear Elasticity   For general anisotropic linear elastic solids with smooth boundaries,
Rayleigh-type surface waves are studied. Using spectral factorizations of
matrix polynomials, a self-contained exposition of the case of a homogeneous
half-space is given first. The main result is about inhomogeneous anisotropic
bodies with curved surfaces. The existence of subsonic free surface waves is
shown by giving ray series asymptotic expansions, including formulas for the
transport equation.

34
The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
9
The categories of this paper are: nlin