Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetries of quasiplatonic Riemann surfaces   We state and prove a corrected version of a theorem of Singerman, which
relates the existence of symmetries (anticonformal involutions) of a
quasiplatonic Riemann surface $\mathcal S$ (one uniformised by a normal
subgroup $N$ of finite index in a cocompact triangle group $\Delta$) to the
properties of the group $G=\Delta/N$. We give examples to illustrate the
revised necessary and sufficient conditions for the existence of symmetries,
and we relate them to properties of the associated dessins d'enfants, or
hypermaps.

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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org