Proof of a conjecture of Plummer and Zha
Proof of a conjecture of Plummer and Zha
复制标题
Plummer 和 Zha 猜想的证明
DOI:
10.1002/jgt.22926
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发表时间:
2023
影响因子:
0.9
通讯作者:
Seymour, Paul
中科院分区:
文献类型:
--
作者:
Chudnovsky, Maria;Seymour, Paul
Say a graphis apentagraphif every cycle has length at least five, and every induced cycle of odd length has length five. Robertson proposed the conjecture that the Petersen graph is the only internally 4‐connected pentagraph, but this was disproved by Plummer and Zha in 2014. Plummer and Zha conjectured that every internally 4‐connected pentagraph is three‐colourable. We prove this: indeed, we will prove that every pentagraph is three‐colourable.
影响因子:
0.7
作者:
M. Plummer;X. Zha
通讯作者:
X. Zha
影响因子:
0.7
作者:
Donald Nelson;M. Plummer;N. Robertson;X. Zha
通讯作者:
X. Zha