Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Remark on the semilinear ill-posedness for a periodic higher order KP-I
  equation   We prove that, for some irrational torus, the flow map of the periodic
fifth-order KP-I equation is not locally uniformly continuous on the energy
space, even on the hyperplanes of fixed x-mean value.

17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex