let us consider a cooperative game G=(N,W) where N={1, ...,n} is the set of players, W is an arbitrary family of subsets of N. Subsets of N are called coalitions, elements of W are called winning coalitions. One of most popular example of cooperative game is a voting game, where each player has a weight ω_I, where ω_I is a natural number. Coalition C is a winning coalition of the sum of weights of members of coalition C is greater that r, where r is defined by the game. Usually, r is greater than a half of the sum of all weights. Voting games are used to describe a situation in a parliament. Players are parties. Weight of are used to describe a situation in a parliament who represent the party.
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