Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological Charge of ADHM Instanton on R^2_{NC}*R^2   We have calculated the topological charge of U(N) instantons on
non-degenerate noncommutative space time to be exactly the instanton number k
in a previous paper [Mod.Phys.Lett. A18 1691]. This paper, which deals with the
degenerate R^2_{NC}*R^2 case, is the continuation of that one. We find that the
same conclusion holds in this case, thus complete the answer to the problem of
topological charge of noncommutative U(N) instantons.

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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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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: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: math