Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Almost complex 4-manifolds with vanishing first Chern class   An odd Seiberg-Witten invariant imposes bounds on the signature of a closed,
almost complex 4-manifold with vanishing first Chern class. This applies in
particular to symplectic 4-manifolds of Kodaira dimension zero.

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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
3
The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin