Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: T-Duality and Mixed Branes   In this article the action of T-duality on a mixed brane is studied in the
boundary state formalism. We also obtain a two dimensional mixed brane with
non-zero electric and magnetic fields, from a D$_1$-brane.

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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: physics
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The categories of this paper are: math-ph