Threshold dominating sets and an improved characterization of W[2]
Theoretical Computer Science
When are elections with few candidates hard to manipulate?
Journal of the ACM (JACM)
Anyone but him: The complexity of precluding an alternative
Artificial Intelligence
Copeland Voting Fully Resists Constructive Control
AAIM '08 Proceedings of the 4th international conference on Algorithmic Aspects in Information and Management
Llull and copeland voting broadly resist bribery and control
AAAI'07 Proceedings of the 22nd national conference on Artificial intelligence - Volume 1
Normalized Range Voting Broadly Resists Control
Theory of Computing Systems
Annals of Mathematics and Artificial Intelligence
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There are different ways for an external agent to influence the outcome of an election. We concentrate on "control" by adding or deleting candidates of an election. Our main focus is to investigate the parameterized complexity of various control problems for different voting systems. To this end, we introduce natural digraph problems that may be of independent interest. They help in determining the parameterized complexity of control for different voting systems including Llull, Copeland, and plurality votings. Devising several parameterized reductions, we provide a parameterized complexity overview of the digraph and control problems with respect to natural parameters.