Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diameter rigidity for Kahler manifolds with positive bisectional
  curvature   We prove that a Kahler manifold with positive bisectional curvature and
maximal diameter is isometric to the complex projective space with the
Fubini-Study metric.

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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: math-ph