Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the combinatorics of symmetrized poly-Bernoulli numbers   In this paper we introduce three combinatorial models for symmetrized
poly-Bernoulli numbers. Based on our models we derive generalizations of some
identities for poly-Bernoulli numbers. Finally, we set open questions and
directions of further studies.

22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ