Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Poisson brackets of hydrodynamic type and their generalizations   In this paper, we consider Hamiltonian structures of hydrodynamic type and
some of their generalizations. In particular, we discuss the questions
concerning the structure and special forms of the corresponding Poisson
brackets and the connection of such structures with the theory of integration
of systems of hydrodynamic type.

35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat