博弈論(Game Theory),有時也稱為對策論,或者賽局理論,應用數學的一個分支, 目前在生物學,經濟學,國際關係,電腦科學, 政治學,軍事戰略和其他很多學科都有廣泛的應用。主要研究公式化了的激勵結構(遊戲或者博弈(Game))間的相互作用。是研究具有鬥爭或競爭性質現象的數學理論和方法。也是運籌學的一個重要學科
Prisoner's dilemma:In game theory, the prisoner's dilemma is a type of non-zero-sum game in which two players can "cooperate" with or "defect" (i.e. betray) the other player. In this game, as in all game theory, the only concern of each individual player ("prisoner") is maximizing his/her own payoff, without any concern for the other player's payoff. In the classic form of this game, cooperating is strictly dominated by defecting, so that the only possible equilibrium for the game is for all players to defect. In simpler terms, no matter what the other player does, one player will always gain a greater payoff by playing defect. Since in any situation playing defect is more beneficial than cooperating, all rational players will play defect.