SAT '09 Proceedings of the 12th International Conference on Theory and Applications of Satisfiability Testing
Induced Packing of Odd Cycles in a Planar Graph
ISAAC '09 Proceedings of the 20th International Symposium on Algorithms and Computation
ISAAC '09 Proceedings of the 20th International Symposium on Algorithms and Computation
Treewidth computations II. Lower bounds
Information and Computation
Theoretical Computer Science
Implicit branching and parameterized partial cover problems
Journal of Computer and System Sciences
Tree-width of hypergraphs and surface duality
Journal of Combinatorial Theory Series B
Note: A note on planar graphs with large width parameters and small grid-minors
Discrete Applied Mathematics
Computational study on bidimensionality theory based algorithm for longest path problem
ISAAC'11 Proceedings of the 22nd international conference on Algorithms and Computation
Lower bounds for treewidth of product graphs
Discrete Applied Mathematics
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In this paper we present a new technique for computing lower bounds for graph treewidth. Our technique is based on the fact that the treewidth of a graph G is the maximum order of a bramble of G minus one. We give two algorithms: one for general graphs, and one for planar graphs. The algorithm for planar graphs is shown to give a lower bound for both the treewidth and branchwidth that is at most a constant factor away from the optimum. For both algorithms, we report on extensive computational experiments that show that the algorithms often give excellent lower bounds, in particular when applied to (close to) planar graphs.