Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positive Dehn Twist Expressions for Some Elements of Finite Order in the
  Mapping Class Group   Positive Dehn twist products for some elements of finite order in the mapping
class group of a 2-dimensional closed, compact, oriented surface $\Sigma_g$,
which are rotations of $\Sigma_g$ through $2\pi /p$, are presented. The
homeomorphism invariants of the resulting simply connected symplectic 4-
manifolds are computed.

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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex