Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards classification of quasi-local symmetries of evolution equations   We develop efficient group-theoretical approach to the problem of
classification of evolution equations that admit non-local transformation
groups (quasi-local symmetries), i.e., groups involving integrals of the
dependent variable. We classify realizations of two- and three-dimensional Lie
algebras leading to equations admitting quasi-local symmetries. Finally, we
generalize the approach in question for the case of an arbitrary system of
evolution equations with two independent variables.

5
The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
3
The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
16
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: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg