Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HexaKdV   An analog of the lattice KdV equation of Nijhoff et al. is constructed on a
hexagonal lattice. The resulting system of difference equations exhibits
soliton solutions with interesting local structure: there is a nontrivial phase
shift on moving between adjacent lattice sites, with the magnitude of the shift
tending to zero in the continuum limit.

10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ