Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: KP solitons and Mach reflection in shallow water   This gives a survey of our recent studies on soliton solutions of the
Kadomtsev-Petviashvili equation with an emphasis on the Mach reflection problem
in shallow water.

13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an