Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Trace Identities for the matrix Schr\"odinger operator on the half line
  with general boundary conditions   We prove Buslaev-Faddeev trace identities for the matrix Schr\"odinger
operator on the half line, with general boundary conditions at the origin, and
with selfadjoint matrix potentials.

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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph