Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excluding 4-wheels   A 4-wheel is a graph formed by a cycle C and a vertex not in C that has at
least four neighbors in C. We prove that a graph G that does not contain a
4-wheel as a subgraph is 4-colorable and we describe some structural properties
of such a graph.

22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph