The stable set of a game (also known as the "von Neumann-Morgenstern solution" ) was the first solution proposed for games with more than 2 players. Let formula_21 be a game and let formula_68, formula_85 be two imputations of formula_21. Then formula_68 "dominates" formula_85 if some coalition formula_89 satisfies formula_90 and formula_91. In other words, players in formula_25 prefer the payoffs from formula_68 to those from formula_85, and they can threaten to leave the grand coalition if formula_85 is used because the payoff they obtain on their own is at least as large as the allocation they receive under formula_68.