Clique minors in graphs with a forbidden subgraph
Clique minors in graphs with a forbidden subgraph
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带有禁止子图的图中的小集团未成年人
DOI:
10.1002/rsa.21038
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发表时间:
2021
影响因子:
1
通讯作者:
Sudakov, Benny
中科院分区:
文献类型:
--
作者:
Bucić, Matija;Fox, Jacob;Sudakov, Benny
The classical Hadwiger conjecture dating back to 1940s states that any graph of chromatic number at leastrhas the clique of orderras a minor. Hadwiger's conjecture is an example of a well‐studied class of problems asking how large a clique minor one can guarantee in a graph with certain restrictions. One problem of this type asks what is the largest size of a clique minor in a graph onnvertices of independence number at mostr. If true Hadwiger's conjecture would imply the existence of a clique minor of order . Results of Kühn and Osthus and Krivelevich and Sudakov imply that if one assumes in addition thatGisH‐free for some bipartite graphHthen one can find a polynomially larger clique minor. This has recently been extended to triangle‐free graphs by Dvořák and Yepremyan, answering a question of Norin. We complete the picture and show that the same is true for arbitrary graphH, answering a question of Dvořák and Yepremyan. In particular, we show that any ‐free graph has a clique minor of order , for some constant depending only ons. The exponent in this result is tight up to a constant factor in front of the term.
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影响因子:
0.8
作者:
Frédéric Maffray;H. Meyniel
通讯作者:
H. Meyniel
DOI:
--
发表时间:
2015
期刊:
Surveys in Combinatorics
影响因子:
--
作者:
S. Norin
通讯作者:
S. Norin
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
Michael Krivelevich;B. Sudakov
通讯作者:
B. Sudakov
影响因子:
1.7
作者:
S. Norin;Zi
通讯作者:
Zi
DOI:
10.1017/s0305004100061521
发表时间:
1984
影响因子:
0.8
作者:
A. Thomason
通讯作者:
A. Thomason