Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mansfield's imprimitivity theorem for arbitrary closed subgroups   Let $\delta$ be a nondegenerate coaction of G on a C*-algebra B, and let H be
a closed subgroup of G. The dual action of H on $B\times_\delta G$ is proper
and saturated in the sense of Rieffel, and the generalised fixed-point algebra
is the crossed product of B by the homogeneous space G/H. The resulting Morita
equivalence is a version of Mansfield's imprimitivity theorem which requires
neither amenability nor normality of H.

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The categories of this paper are: nlin
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The categories of this paper are: stat
4
The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th