Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solutions to the ultradiscrete KdV equation expressed as the maximum of
  a quadratic function   We propose the functions defined by the maximum of a discrete quadratic form
and satisfying the ultradiscrete KdV equation. These functions includes not
only soliton solutions but also pseudo-periodic solutions. In the proof, we
employ some facts of discrete convex analysis.

11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga