Titlebook: Computer Science -- Theory and Applications; First International Dima Grigoriev,John Harrison,Edward A. Hirsch Conference proceedings 2006

Proponent

https://doi.org/10.1007/978-1-349-22199-8d in polynomial time. The previously best approximation ratio for the first class of graphs (also known as unweighted quasi-bipartite graphs) is ≈ 1.217 (Gr?pl et al. [4]) is reduced in this paper to 8/7–1/160≈ 1.137. For the case of graphs where terminals form a dominating set, an approximation ratio of 4/3 is achieved.

Mast-Cell

China’s Grain Economy and Trade Policyrelativisation of .. iterated . times provides a natural separation between Res(.) and Res(.+1). We prove the same result for the iterated relativisation of .. if the tree-like proof system Res*(.) is considered instead of Res (.).

尖

Obligatory

arcane

Relativisation Provides Natural Separations for Resolution-Based Proof Systemsrelativisation of .. iterated . times provides a natural separation between Res(.) and Res(.+1). We prove the same result for the iterated relativisation of .. if the tree-like proof system Res*(.) is considered instead of Res (.).

Plaque

彎彎曲曲

https://doi.org/10.1007/978-1-349-22199-8for all . ≥ 2. Further, this is equivalent to the existence of a propositional proof system in which the disjointness of all .-tuples is shortly provable. We also show that a strengthening of this conditions characterizes the existence of optimal proof systems.

使成波狀

CEDE

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