Bounds for Unions of Several Parts in Balanced Graph Partitions

Abstract

Let $k\ge3$ and $1\le \ell\le k-1$. We study balanced $k$-partitions of a graph for which the union of any $\ell$ parts induces few edges. We show that every graph $G$ with $n$ vertices and $m$ edges admits a balanced partition $V_1,\ldots,V_k$ such that \begin{equation*} \max_{\substack{A\in\binom{[k]}{\ell}}}e_G\left(\bigcup_{i\in A}V_i\right)\le\frac{\ell^2}{k^2}m+\frac{\ell^2(k-\ell)}{k^2}(n-1)+\frac{\ell(k-\ell)}{k(k-1)}\sqrt{\left(\binom{k}{\ell}-1\right)m}. \end{equation*} In the case $\ell=2$, our result confirms a conjecture of Bollob\'as and Scott in a stronger form.