Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalised Moonshine and Holomorphic Orbifolds   Generalised moonshine is reviewed from the point of view of holomorphic
orbifolds, putting special emphasis on the role of the third cohomology group
H^3(G, U(1)) in characterising consistent constructions. These ideas are then
applied to the case of Mathieu moonshine, i.e. the recently discovered
connection between the largest Mathieu group M_24 and the elliptic genus of K3.
In particular, we find a complete list of twisted twining genera whose modular
properties are controlled by a class in H^3(M_24, U(1)), as expected from
general orbifold considerations.

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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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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: physics
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th