Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A First Course on Twistors, Integrability and Gluon Scattering
  Amplitudes   These notes accompany an introductory lecture course on the twistor approach
to supersymmetric gauge theories aimed at early-stage PhD students. It was held
by the author at the University of Cambridge during the Michaelmas term in
2009. The lectures assume a working knowledge of differential geometry and
quantum field theory. No prior knowledge of twistor theory is required.

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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: physics
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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: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga