Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towers with skeletons for the (2+1)-dimensional continuous isotropic
  Heisenberg spin model   We associate a tower with an infinitesimal algebraic skeleton to the
(2+1)-dimensional (compact and noncompact) Heisenberg spin model. In
particular, we construct the absolute parallelism defining the tower and the
corresponding extension of the adjoint Lie algebra representation defining its
skeleton.

17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc