Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Instantons in non-Cartesian coordinates   The explicit multi-instanton solutions by 'tHooft and Jackiw, Nohl & Rebbi
are generalized to curvilinear coordinates. The idea is that a gauge
transformation can notably simplify the expressions obtained after the change
of variables. The gauge transform generates a compensating addition to the
gauge potential of pseudoparticles. Singularities of the compensating field are
irrelevant for physics but may affect gauge dependent quantities.

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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
3
The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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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: chao-dyn