Polynomial χ-binding functions for t-broom-free graphs
Polynomial χ-binding functions for t-broom-free graphs
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无 t-broom 图的多项式 Ï 绑定函数
DOI:
10.1016/j.jctb.2023.04.005
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Yu, Xingxing
中科院分区:
文献类型:
--
作者:
Liu, Xiaonan;Schroeder, Joshua;Wang, Zhiyu;Yu, Xingxing
For any positive integer t, a t-broom is a graph obtained from K 1, t+ 1 by subdividing an edge once. In this paper, we show that, for graphs G without induced t-brooms, we have χ (G)= o (ω (G) t+ 1), where χ (G) and ω (G) are the chromatic number and clique number of G, respectively. When t= 2, this answers a question of Schiermeyer and Randerath. Moreover, for t= 2, we strengthen the bound on χ (G) to 7 ω (G) 2, confirming a conjecture of Sivaraman. For t≥ 3 and {t-broom, K t, t}-free graphs, we improve the bound to o (ω t).
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DOI:
10.1016/0012-365x(80)90230-7
发表时间:
1980
期刊:
Discret. Math.
影响因子:
--
作者:
A. Gyárfás;E. Szemerédi;Z. Tuza
通讯作者:
A. Gyárfás;E. Szemerédi;Z. Tuza
DOI:
10.37236/9144
发表时间:
2021
期刊:
The Electronic Journal of Combinatorics
影响因子:
--
作者:
Chudnovsky, Maria;Huang, Shenwei;Karthick, T.;Kaufmann, Jenny
通讯作者:
Kaufmann, Jenny
影响因子:
0.9
作者:
Scott, Alex;Seymour, Paul;Spirkl, Sophie
通讯作者:
Spirkl, Sophie
影响因子:
0.7
作者:
T. Karthick;Jenny Kaufmann;Vaidy Sivaraman
通讯作者:
Vaidy Sivaraman
DOI:
10.1002/jgt.3190180203
发表时间:
1994-03
期刊:
J. Graph Theory
影响因子:
--
作者:
H. Kierstead;S. Penrice
通讯作者:
H. Kierstead;S. Penrice