Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Examples of fourth-order scattering-type operators with embedded
  eigenvalues in their continuous spectra   We give examples of fourth-order scattering-type operators, acting on
$L_2(\mathbb{R})$, which have eigenvalues embedded in their continuous spectra.

28
The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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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: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: physics
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc