Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetries of the Continuous and Discrete Krichever-Novikov Equation   A symmetry classification is performed for a class of differential-difference
equations depending on 9 parameters. A 6-parameter subclass of these equations
is an integrable discretization of the Krichever-Novikov equation. The
dimension $n$ of the Lie point symmetry algebra satisfies $1 \le n \le 5$. The
highest dimensions, namely $n=5$ and $n=4$ occur only in the integrable cases.

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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int