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Preferences Single-Peaked on a Tree: Multiwinner Elections and Structural Results
2022
The Journal of Artificial Intelligence Research
A preference profile is single-peaked on a tree if the candidate set can be equipped with a tree structure so that the preferences of each voter are decreasing from their top candidate along all paths in the tree. This notion was introduced by Demange (1982), and subsequently Trick (1989b) described an efficient algorithm for deciding if a given profile is single-peaked on a tree. We study the complexity of multiwinner elections under several variants of the Chamberlin–Courant rule for
doi:10.1613/jair.1.12332
fatcat:y55incikefb45nf4ottyioveiq