Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-standard Construction of Hamiltonian Structures   Examples of the construction of Hamiltonian structures for dynamical systems
in field theory (including one reputedly non-Hamiltonian problem) without using
Lagrangians, are presented. The recently developed method used requires the
knowledge of one constant of the motion of the system under consideration and
one solution of the symmetry equation.

4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th