A More Complicated Hardness Proof for Finding Densest Subgraphs in Bounded Degree Graphs
arXiv:1306.6598
Abstract
We consider the Densest-Subgraph problem, where a graph and an integer k is given and we search for a subgraph on exactly k vertices that induces the maximum number of edges. We prove that this problem is NP-hard even when the input graph has maximum degree three.