Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Type IIA D-Branes, K-Theory, and Matrix Theory   We show that all supersymmetric Type IIA D-branes can be constructed as bound
states of a certain number of unstable non-supersymmetric Type IIA D9-branes.
This string-theoretical construction demonstrates that D-brane charges in Type
IIA theory on spacetime manifold $X$ are classified by the higher K-theory
group $K^{-1}(X)$, as suggested recently by Witten. In particular, the system
of $N$ D0-branes can be obtained, for any $N$, in terms of sixteen Type IIA
D9-branes. This suggests that the dynamics of Matrix theory is contained in the
physics of magnetic vortices on the worldvolume of sixteen unstable D9-branes,
described at low energies by a U(16) gauge theory.

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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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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: nucl-ex
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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: acc-phys
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The categories of this paper are: hep-ph
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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: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex