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- W2201560525 abstract "In many real-world settings, the structure of the environment constrains the formation of coalitions among agents. These settings can be represented by characteristic function games, also known as coalitional games, equipped with interaction graphs. An interaction graph determines the set of all feasible coalitions, in that a coalition C can form only if the subgraph induced over the nodes/agents in C is connected. Our work analyzes stability issues arising in such environments, by focusing on the core as a solution concept, and by considering the coalition structure viewpoint, that is, without assuming that the grand-coalition necessarily forms. The complexity of the coalition structure core is studied over a variety of interaction graph structures of interest, including complete graphs, lines, cycles, trees, and nearly-acyclic graphs (formally, having bounded treewidth). The related stability concepts of the least core and the cost of stability are also studied. Results are derived for the setting of compact coalitional games, i.e., for games that are implicitly described via a compact encoding, and where simple calculations on this encoding are to be performed in order to compute the payoff associated with any coalition. Moreover, specific results are provided for compact games defined via marginal contribution networks, an expressive encoding mechanism that received considerable attention in the last few years." @default.
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- W2201560525 date "2016-03-01" @default.
- W2201560525 modified "2023-10-04" @default.
- W2201560525 title "Characteristic function games with restricted agent interactions: Core-stability and coalition structures" @default.
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- W2201560525 doi "https://doi.org/10.1016/j.artint.2015.12.005" @default.
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