Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Characterization of Substar Graphs   The intersection graphs of stars in some tree are known as substar graphs. In
this paper we give a characterization of substar graphs by the list of minimal
forbidden induced subgraphs. This corrects a flaw in the main result of Chang,
Jacobson, Monma and West (Subtree and substar intersection numbers, Discrete
Appl. Math. 44, 205-220 (1993)) and this leads to a different list of minimal
forbidden induced subgraphs.

16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph