Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometric Structure of Two Self-dual Fields with Constraints   A two dimensional Poincar$\acute{e}$-invariant self-dual field with
constraints is studied in geometric way. We obtained its symplectic structure
and conservative currents on space of solutions, which are also invariant under
transformations of Poincar$\acute{e}$ group.

13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph