Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: J-Self-Adjointness of a Class of Dirac-Type Operators   In this note we prove that the maximally defined operator associated with a
class of Dirac-type differential expressions M(Q) is J-self-adjoint with
respect to a proper antilinear conjugation J under the general hypothesis that
the entries of the matrix potential coefficient Q are locally integrable on the
real line.
  The Dirac-type differential expression M(Q) is of significance as it appears
in the Lax formulation of the nonabelian (matrix-valued) focusing nonlinear
Schr\"odinger hierarchy of evolution equations.

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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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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: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph