Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Classical r-Matrix for the Kowalevski Gyrostat on so(4)   We present the trigonometric Lax matrix and classical r-matrix for the
Kowalevski gyrostat on so(4) algebra by using the auxiliary matrix algebras
so(3,2) or sp(4).

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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
3
The categories of this paper are: physics
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph