Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Dirac structures admitting a variational approach   We discuss the notion of basic cohomology for Dirac structures and, more
generally, Lie algebroids. We then use this notion to characterize the
obstruction to a variational formulation of Dirac dynamics.

19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph