Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relative Cuntz-Pimsner Algebras, Partial Isometric Crossed Products and
  Reduction of Relations   The article discusses the interrelation between relative Cuntz-Pimsner
algebras and partial isometric crossed products, and presents a procedure that
reduces any given Hilbert bimodule to the "smallest" Hilbert bimodule yielding
the same relative Cuntz-Pimsner algebra as the initial one. In the context of
crossed products this reduction procedure corresponds to reduction of
C*-dynamical systems.

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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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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: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin