Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: All Subgraphs of a Wheel are 5-Coupled-Choosable   A wheel graph consists of a cycle along with a center vertex connected to
every vertex in the cycle. In this paper we show that every subgraph of a wheel
graph has list coupled chromatic number at most 5, and this coloring can be
found in linear time. We further show that `5' is tight for every wheel graph
with at least 5 vertices, and briefly discuss possible generalizations to
planar graphs of treewidth 3.

22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph