Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The $\bar\mu$-invariant of Seifert fibered homology spheres and the
  Dirac operator   We derive a formula for the $\bar\mu$-invariant of a Seifert fibered homology
sphere in terms of the eta-invariant of its Dirac operator. As a consequence,
we obtain a vanishing result for the index of certain Dirac operators on
plumbed 4-manifolds bounding such spheres.

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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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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: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex