Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rational solutions of the Boussinesq equation and applications to rogue
  waves   We study rational solutions of the Boussinesq equation, which is a soliton
equation solvable by the inverse scattering method. These rational solutions,
which are algebraically decaying and depend on two arbitrary parameters, are
expressed in terms of special polynomials that are derived through a bilinear
equation, have a similar appearance to rogue-wave solutions of the focusing
nonlinear Schr\"odinger (NLS) equation and have an interesting structure.
Further rational solutions of the Kadomtsev-Petviashvili I (KPI) equation are
derived in two ways, from rational solutions of the NLS equation and from
rational solutions of the Boussinesq equation. It is shown that the two
families of rational solutions of the KPI equation are fundamentally different.

26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th