Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetry Analysis and Conservation Laws of some third-order Difference
  Equations   We derive a method for finding Lie Symmetries for third-order difference
equations. We use these symmetries to reduce the order of the difference
equations and hence obtain the solutions of some third-order difference
equations. We also introduce a technique for obtaining their first integrals.

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The categories of this paper are: cs
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The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex