Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Instanton Operators in Five-Dimensional Gauge Theories   We discuss instanton operators in five-dimensional gauge theories. These are
defined as disorder operators which create a non-vanishing second Chern class
on a four-sphere surrounding their insertion point. As such they may be thought
of as higher-dimensional analogues of three-dimensional monopole (or `t Hooft)
operators. We argue that they play an important role in the enhancement of the
Lorentz symmetry for maximally supersymmetric Yang-Mills to SO(1,5) at strong
coupling.

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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: math