Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetries of vector exterior differential systems and the inverse
  problem in second-order Ostrohrads'kyj mechanics   Symmetries of variational problems are considered as symmetries of vector
bundle valued exterior differential systems. This approach is then applied to
third order ordinary variational equations of motion of the semi-classical
spinning particle.

8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin