论文标题

最大和弦子图

Maximal Chordal Subgraphs

论文作者

Gishboliner, Lior, Sudakov, Benny

论文摘要

和弦图是一个没有诱导的循环至少$ 4 $的图形。令$ f(n,m)$为最大整数,以使每个具有$ n $顶点和$ m $ edges的图形具有至少$ f(n,m)$边缘的和弦子图。 1985年,ErdőS和Laskar提出了估计$ F(N,M)$的问题。在80年代后期,Erdős,Gyárfás,Ordman和Zalcstein确定了$ f(n,n^2/4+1)$的值,并猜想了$ f(n,n^2/3+1)$的值。在本文中,我们证明了这个猜想,并回答了Erdős和Laskar的问题,对所有$ m $ y nake $ f(n,m)$渐近,正是$ m \ m \ leq n^2/3+1 $。

A chordal graph is a graph with no induced cycles of length at least $4$. Let $f(n,m)$ be the maximal integer such that every graph with $n$ vertices and $m$ edges has a chordal subgraph with at least $f(n,m)$ edges. In 1985 Erdős and Laskar posed the problem of estimating $f(n,m)$. In the late '80s, Erdős, Gyárfás, Ordman and Zalcstein determined the value of $f(n,n^2/4+1)$ and made a conjecture on the value of $f(n,n^2/3+1)$. In this paper we prove this conjecture and answer the question of Erdős and Laskar, determining $f(n,m)$ asymptotically for all $m$ and exactly for $m \leq n^2/3+1$.

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