Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hyperbolic Twistor Spaces   In contrast to the classical twistor spaces whose fibres are 2-spheres, we
introduce twistor spaces over manifolds with almost quaternionic structures of
the second kind in the sense of P. Libermann whose fibres are hyperbolic
planes. We discuss two natural almost complex structures on such a twistor
space and their holomorphic functions.

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The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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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: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph