A Relative of Hadwiger's Conjecture

A Relative of Hadwiger's Conjecture
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哈维格猜想的一个亲戚

DOI:
10.1137/141002177
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发表时间:
2014
期刊:
SIAM J. Discret. Math.
影响因子:
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通讯作者:
P. Seymour
P. Seymour
中科院分区:
--
文献类型:
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作者:
Katherine Edwards;D. Kang;Jaehoon Kim;Sang;P. Seymour

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Hadwiger猜想认为,如果简单图G没有K t+1的子图,则它的顶点集V(G)可划分为t个稳定集。这仍然是开放的,但我们证明了在相同的假设下,$V(G)$可以划分为$t$集$X_1,\ldots,X_t $,使得对于$1\le i\le t$,在$X_i$上诱导的子图的最大度至多为$t$的函数。这是尖锐的,因为如果我们要求划分成具有相同性质的$t-1$集,结论就变成假的。
Hadwiger's conjecture asserts that if a simple graph $G$ has no $K_{t+1}$ minor, then its vertex set $V(G)$ can be partitioned into $t$ stable sets. This is still open, but we prove under the same hypothesis that $V(G)$ can be partitioned into $t$ sets $X_1,\ldots,X_t$, such that for $1\le i\le t$, the subgraph induced on $X_i$ has maximum degree at most a function of $t$. This is sharp, in that the conclusion becomes false if we ask for a partition into $t-1$ sets with the same property.