Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infinitely Many Commuting Nonlocal Symmetries for Modified Martinez
  Alonso-Shabat Equation   We present a recursion operator and an infinite hierarchy of nonlocal
commuting symmetries for the modified Martinez Alonso-Shabat equation $u_y
u_{xz} + \alpha u_x u_{ty} - (u_z + \alpha u_t)u_{xy} = 0$.

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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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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: math-ph