The Complexity of Computing Minimal Unidirectional Covering Sets
The Complexity of Computing Minimal Unidirectional Covering Sets
复制标题
计算最小单向覆盖集的复杂性
DOI:
10.1007/s00224-012-9437-9
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发表时间:
2013
影响因子:
0.5
通讯作者:
J. Rothe
中科院分区:
文献类型:
--
作者:
D. Baumeister;F. Brandt;F. Fischer;J. Hoffmann;J. Rothe
A common thread in the social sciences is to identify sets of alternatives that satisfy certain notions of stability according to some binary dominance relation. Examples can be found in areas as diverse as voting theory, game theory, and argumentation theory. Brandt and Fischer (in Math. Soc. Sci. 56(2):254–268, 2008) proved that it is NP-hard to decide whether an alternative is contained in some inclusion-minimal unidirectional (i.e., either upward or downward) covering set. For both problems, we raise this lower bound to thelevel of the polynomial hierarchy and provide aupper bound. Relatedly, we show that a variety of other natural problems regarding minimal or minimum-size unidirectional covering sets are hard or complete for either of NP, coNP, and. An important consequence of our results is that neither minimal upward nor minimal downward covering sets (even when guaranteed to exist) can be computed in polynomial time unless P=NP. This sharply contrasts with Brandt and Fischer’s result that minimal bidirectional covering sets are polynomial-time computable.
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DOI:
--
发表时间:
2001
期刊:
RAIRO - Theoretical Informatics and Applications
影响因子:
--
作者:
E. Hemaspaandra;J. Rothe;Holger Spakowski
通讯作者:
Holger Spakowski
影响因子:
0.5
作者:
L. Valiant
通讯作者:
L. Valiant
影响因子:
0.9
作者:
G. Woeginger
通讯作者:
G. Woeginger
DOI:
--
发表时间:
2002
期刊:
SIGA
影响因子:
--
作者:
L. Hemaspaandra
通讯作者:
L. Hemaspaandra
DOI:
--
发表时间:
1989
期刊:
SIAM journal on computing (Print)
影响因子:
--
作者:
Jin;T. Gundermann;J. Hartmanis;L. Hemaspaandra;V. Sewelson;K. Wagner;G. Wechsung
通讯作者:
G. Wechsung