Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coverings over Lax integrable equations and their nonlocal symmetries   Using the Lax representation with non-removable parameter, we construct two
hierarchies of nonlocal conservation laws for the 3D rdDym equation $u_{ty} =
u_xu_{xy} - u_yu_{xx}$ and describe the algebras of nonlocal symmetries in the
corresponding coverings.

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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin