Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stack-number is not bounded by queue-number   We describe a family of graphs with queue-number at most 4 but unbounded
stack-number. This resolves open problems of Heath, Leighton and Rosenberg
(1992) and Blankenship and Oporowski (1999).

12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn