Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A multidimensionally consistent version of Hirota's discrete KdV
  equation   A multidimensionally consistent generalisation of Hirota's discrete KdV
equation is proposed, it is a quad equation defined by a polynomial that is
quadratic in each variable. Soliton solutions and interpretation of the model
as superposition principle are given. It is discussed how an important property
of the defining polynomial, a factorisation of discriminants, appears also in
the few other known discrete integrable multi-quadratic models.

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The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg