Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The action of a compact Lie group on nilpotent Lie algebras of type
  {n,2}   We classify finite-dimensional nilpotent Lie algebras with $2$-dimensional
central commutator ideals admitting a Lie group of automorphisms isomorphic to
$SO_2(\mathbb R)$. This enables one to enlarge the class of nilpotent Lie
algebras of type {n,2}.

22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an