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第401行： − 在进化均衡策略的经典定义中，没有任何突变策略可以入侵。然而在有限种群中，尽管可能性很小，但是任意一种突变体原则上是可能入侵的，这就意味着在这个种群中绝对没有进化均衡策略的存在。如果在无限种群中，存在一个概率为P的新突变策略入侵，此时，进化均衡策略就被认为是具有概率大于p的策略方案且开始反击最初入侵的新突变策略个体，就像对冲交易的进化过程所描述的那样。+
→Stochastic ESS 随机的进化均衡策略
In the classic definition of an ESS, no mutant strategy can invade. In finite populations, any mutant could in principle invade, albeit at low probability, implying that no ESS can exist. In an infinite population, an ESS can instead be defined as a strategy which, should it become invaded by a new mutant strategy with probability p, would be able to counterinvade from a single starting individual with probability >p, as illustrated by the evolution of bet-hedging.
In the classic definition of an ESS, no mutant strategy can invade. In finite populations, any mutant could in principle invade, albeit at low probability, implying that no ESS can exist. In an infinite population, an ESS can instead be defined as a strategy which, should it become invaded by a new mutant strategy with probability p, would be able to counterinvade from a single starting individual with probability >p, as illustrated by the evolution of bet-hedging.
在进化均衡策略的经典定义中，没有任何突变策略可以入侵。然而在有限种群中，尽管可能性很小，但是任意一种突变体原则上是可能入侵的，这就意味着在这个种群中绝对没有进化均衡策略的存在。如果在无限种群中，存在一个概率为P的新突变策略入侵，此时，正如对冲交易的进化过程所描述的那样，进化均衡策略就被认为是具有概率大于p的策略方案且开始反击最初入侵的新突变策略个体。
== Prisoner's dilemma 囚徒困境 ==
== Prisoner's dilemma 囚徒困境 ==