Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Holomorphic Couplings in String Theory   In these lectures we review the properties of holomorphic couplings in the
effective action of four-dimensional N=1 and N=2 closed string vacua. We
briefly outline their role in establishing a duality among (classes of)
different string vacua. (Lectures presented by J. Louis at the Trieste Spring
School 1996.)

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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom