Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the exactness of Kostant-Kirillov form and the second cohomology of
  nilpotent orbits   We give a criterion for the Kostant-Kirillov form on an adjoint orbit in a
real semisimple Lie group to be exact. We explicitly compute the second
cohomology of all the nilpotent adjoint orbits in every complex simple Lie
algebras.

15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ