Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Toric rings of nonsimple polyominoes   It is known that toric ring of a simple polyomino is ring homomorphic to a
edge ring of a weakly chordal bipartite graph. In this paper we identify the
toric ring of nonsimple polyominoes which are of the form "rectangle minus
rectangle".

22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics