Weighted games without a unique minimal representation in integers

Abstract

Isbell in 1959 was the first to find a weighted game without a minimum integer realization in which the affected players do not play a symmetric role in the game. His example has 12 players is a weighted decisive game, i.e. a weighted game for which a coalition wins iff its complement loses. The goal of this paper is to provide a procedure for weighted games that allows finding out what is the minimum number of players needed to get a weighted game without a minimum integer weighted representation in which the affected players do not play a symmetric role in the game. We prove, by means of an algorithm, that the minimum number of voters required is 9.Recerca de jocs amb mínim número de jugadors sense representacions enteres mínimes o mínimes normalitzadesPreprin