Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Approximating Novikov-Shubin numbers of virtually cyclic coverings   We assign real numbers to finite sheeted coverings of compact CW complexes
designed as finite counterparts to the Novikov-Shubin numbers. We prove an
approximation theorem in the case of virtually cyclic fundamental groups
employing methods from Diophantine approximation.

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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
3
The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: eess