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arXiv 2108.06359math.CO
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无偶图中的极大独立集

Maximal independent sets in clique-free graphs

Xiaoyu He, Jiaxi Nie, Sam Spiro

摘要:

Nielsen证明了$n$ -顶点图中$k$大小的最大独立集(MIS)的最大数目渐近于$(n/k)^k$,其极值结构是$k$团的不相交并,其大小尽可能接近$n/k$.在本文中,我们研究了有多少MIS的大小$k$的$n$顶点图$G$可以有,如果$G$不包含一个团$K_t$。利用Gowers和B. Janzer关于Ruzsa-Szemerédi问题的推广。我们证明了当$k\le 4$。

英文摘要:

Nielsen proved that the maximum number of maximal independent sets (MIS's) of size $k$ in an $n$-vertex graph is asymptotic to $(n/k)^k$, with the extremal construction a disjoint union of $k$ cliques with sizes as close to $n/k$ as possible. In this paper we study how many MIS's of size $k$ an $n$-vertex graph $G$ can have if $G$ does not contain a clique $K_t$. We prove for all fixed $k$ and $t$ that there exist such graphs with $n^{\lfloor\frac{(t-2)k}{t-1}\rfloor-o(1)}$ MIS's of size $k$ by utilizing recent work of Gowers and B. Janzer on a generalization of the Ruzsa-Szemerédi problem. We prove that this bound is essentially best possible for triangle-free graphs when $k\le 4$.

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