Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the boundedness of the sectional curvature of almost Hermitian
  manifolds   We prove the following results: An almost Hermitian manifold of indefinite
metric is of pointwise constant holomorphic sectional curvature if the
holomorphic sectional curvature is bounded from above and from below. If the
antiholomorphic sectional curvature is bounded either from above or from below,
then the manifold is of pointwise constant antiholomorphic sectional curvature.
Similar results are obtained for almost Hermitian manifolds of definite metric.

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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th