Simple games versus weighted voting games

Frits Hof, Walter Kern, Sascha Kurz, Daniël Paulusma*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)


A simple game (N, v) is given by a set N of n players and a partition of 2N into a set L of losing coalitions L with value v(L)=0 that is closed under taking subsets and a set W of winning coalitions W with v(W)=1. Simple games with (Formula Presented) are exactly the weighted voting games. Freixas and Kurz (IJGT, 2014) conjectured that (Formula Presented) for every simple game (N, v). We confirm this conjecture for two complementary cases, namely when all minimal winning coalitions have size 3 and when no minimal winning coalition has size 3. As a general bound we prove that (Formula Presented) for every simple game (N, v). For complete simple games, Freixas and Kurz conjectured that (Formula Presented). We prove this conjecture up to a ln n factor. We also prove that for graphic simple games, that is, simple games in which every minimal winning coalition has size 2, computing α is NP-hard, but polynomial-time solvable if the underlying graph is bipartite. Moreover, we show that for every graphic simple game, deciding if α > a is polynomial-time solvable for every fixed a<0.

Original languageEnglish
Title of host publicationAlgorithmic Game Theory - 11th International Symposium, SAGT 2018, Proceedings
EditorsXiaotie Deng
Number of pages13
ISBN (Print)9783319996592
Publication statusPublished - 2018
Event11th International Symposium on Algorithmic Game Theory, SAGT 2018 - Beijing, China
Duration: 11 Sept 201813 Sept 2018
Conference number: 11

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume11059 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference11th International Symposium on Algorithmic Game Theory, SAGT 2018
Abbreviated titleSAGT 2018


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