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TCS
2008
14 years 9 months ago
Cleaning a network with brushes
Following the decontamination metaphor for searching a graph, we introduce a cleaning process, which is related to both the chip-firing game and edge searching. Brushes (instead o...
Margaret-Ellen Messinger, Richard J. Nowakowski, P...
88
Voted
APAL
2008
84views more  APAL 2008»
14 years 9 months ago
Resolution over linear equations and multilinear proofs
We develop and study the complexity of propositional proof systems of varying strength extending resolution by allowing it to operate with disjunctions of linear equations instead ...
Ran Raz, Iddo Tzameret
FMSD
2007
97views more  FMSD 2007»
14 years 9 months ago
On the optimal reachability problem of weighted timed automata
We study the cost-optimal reachability problem for weighted timed automata such that positive and negative costs are allowed on edges and locations. By optimality, we mean an infi...
Patricia Bouyer, Thomas Brihaye, Véronique ...
94
Voted
FOCS
2009
IEEE
15 years 4 months ago
Approximation Algorithms for Multicommodity-Type Problems with Guarantees Independent of the Graph Size
— Linial, London and Rabinovich [16] and Aumann and Rabani [3] proved that the min-cut max-flow ratio for general maximum concurrent flow problems (when there are k commodities...
Ankur Moitra
COCO
2010
Springer
129views Algorithms» more  COCO 2010»
15 years 1 months ago
On the Relative Strength of Pebbling and Resolution
The last decade has seen a revival of interest in pebble games in the context of proof complexity. Pebbling has proven to be a useful tool for studying resolution-based proof syst...
Jakob Nordström