TY - GEN A1 - Koster, Arie M.C.A. A1 - Wolle, Thomas A1 - Bodlaender, Hans L. T1 - Degree-Based Treewidth Lower Bounds N2 - Every lower bound for treewidth can be extended by taking the maximum of the lower bound over all subgraphs or minors. This extension is shown to be a very vital idea for improving treewidth lower bounds. In this paper, we investigate a total of nine graph parameters, providing lower bounds for treewidth. The parameters have in common that they all are the vertex-degree of some vertex in a subgra ph or minor of the input graph. We show relations between these graph parameters and study their computational complexity. To allow a practical comparison of the bounds, we developed heuristic algorithms for those parameters that are NP-hard to compute. Computational experiments show that combining the treewidth lower bounds with minors can considerably improve the lower bounds. T3 - ZIB-Report - 04-44 KW - contraction degeneracy KW - Ramachandramurthi parameter KW - treewidth lower bounds Y1 - 2004 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-8193 ER -