A motion is any vote involving only two alternatives.
A player is a voter in a weighted voting system.
The weight of each player is the number of votes he/she controls.
The quota is the minimum number votes needed to pass a motion.
A dictator is a player who has enough votes to pass any motion single-handedly.
A dummy is a player with no power.
A player that is not a dictator but can single-handedly prevent any group of players from passing a motion is said to have veto power.
A coalition is any group of players that join forces to vote together.
A player whose desertion of a winning coalition turns it into a losing one is called a critical player.
A sequential coalition is one in which the players are listed in the order that they entered the coalition.
A pivotal player is the player in a sequential coalition who changes the coalition from a losing to a winning one.
N! = N(N-1)(N-2) ...(2)(1)
6! = 6(5)(4)(3)(2)(1) = 720
4! = 4(3)(2)(1) = 24
and, by definition,
0! = 1