Decreasing the maximum average degree by deleting an independent set or a d-degenerate subgraph
Abstract
The maximum average degree $\mathrm{mad}(G)$ of a graph $G$ is the maximum average degree over all subgraphs of $G$. In this paper we prove that for every $G$ and positive integer $k$ such that $\mathrm{mad}(G) \ge k$ there exists $S \subseteq V(G)$ such that $\mathrm{mad}(G - S) \le \mathrm{mad}(G) - k$ and $G[S]$ is $(k-1)$-degenerate. Moreover, such $S$ can be computed in polynomial time. In particular there exists an independent set $I$ in $G$ such that $\mathrm{mad}(G-I) \le \mathrm{mad}(G)-1$ and an induced forest $F$ such that $\mathrm{mad}(G-F) \le \mathrm{mad}(G) - 2$.
- Publication:
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arXiv e-prints
- Pub Date:
- September 2019
- DOI:
- 10.48550/arXiv.1909.10701
- arXiv:
- arXiv:1909.10701
- Bibcode:
- 2019arXiv190910701N
- Keywords:
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- Computer Science - Discrete Mathematics;
- Mathematics - Combinatorics