Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalization of extended Lie algebras by expansions of extended de
  Sitter algebra, in four-dimensions   Four-dimensional extended: Poincar\'e, AdS-Lorentz and Maxwell algebras, are
obtained by expanding an extension of de Sitter or conformal algebra, SO(4,1)
or SO(3,2). The procedure can be generalized to obtain a new family of extended
$\mathcal{C}_k^{E}$ and its flat limit, the extended $\mathcal{B}_k^{E}$
algebras. The extended $\mathcal{C}_k$ and $\mathcal{B}_k$ algebras have been
introduced in the literature recently.The extended Poincar\'e algebra is also
obtained as an In\"on\"u-Wigner contraction of extended de Sitter algebra.

20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat