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- W3189936499 abstract "We study the setting of committee elections, where a group of individuals needs to collectively select a given-size subset of available objects. This model is relevant for a number of real-life scenarios including political elections, participatory budgeting, and facility-location. We focus on the core—the classic notion of proportionality, stability and fairness. We show that for a number of restricted domains including voter-interval, candidate-interval, single-peaked, and single-crossing preferences the core is non-empty and can be found in polynomial time. We show that the core might be empty for strict top-monotonic preferences, yet we introduce a relaxation of this class, which guarantees non-emptiness of the core. Our algorithms work both in the randomized and discrete models. We also show that the classic known proportional rules do not return committees from the core even for the most restrictive domains among those we consider (in particular for 1D-Euclidean preferences). We additionally prove a number of structural results that give better insights into the nature of some of the restricted domains, and which in particular give a better intuitive understanding of the class of top-monotonic preferences." @default.
- W3189936499 created "2021-08-16" @default.
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- W3189936499 date "2022-01-01" @default.
- W3189936499 modified "2023-09-27" @default.
- W3189936499 title "Core-Stable Committees Under Restricted Domains" @default.
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- W3189936499 doi "https://doi.org/10.1007/978-3-031-22832-2_18" @default.
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