Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Froehlich Polarons From 3D to 0D. Concepts and Recent Developments   An overview is presented of the fundamentals of continuum-polaron physics,
which provide the basis of the analysis of polaron effects in ionic crystals
and polar semiconductors. The present paper deals with "large", or "continuum",
polarons, as described by the Froehlich Hamiltonian. The emphasis is on the
polaron optical absorption.

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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex