Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Uniqueness of symplectic canonical class, surface cone and symplectic
  cone of 4-manifolds with b^+=1   Let M be a closed oriented smooth 4-manifold admitting symplectic structures.
If M is minimal and has b^+=1, we prove that there is a unique symplectic
canonical class up to sign, and any real second cohomology class of positive
square is represented by symplectic forms. Similar results hold when M is not
minimal.

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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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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: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs
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The categories of this paper are: nlin