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→Nash equilibrium
1. E(S,S) ≥ E(T,S)，and
1. E(S,S) ≥ E(T,S)，and
2. E(S,T) > E(T,T)，
2. E(S,T) > E(T,T)，
There is also an alternative, stronger definition of ESS, due to Thomas. This places a different emphasis on the role of the Nash equilibrium concept in the ESS concept. Following the terminology given in the first definition above, this definition requires that for all T≠S
There is also an alternative, stronger definition of ESS, due to Thomas. This places a different emphasis on the role of the Nash equilibrium concept in the ESS concept. Following the terminology given in the first definition above, this definition requires that for all T≠S
1. E(S,S) ≥ E(T,S)，and
1. E(S,S) ≥ E(T,S)，and
2. E(S,T) > E(T,T)，
2. E(S,T) > E(T,T)，
后来伯恩哈德·托马斯Bernhard Thomas在他的论文《On evolutionarily stable sets》中提出了更大胆的定义。它不同于纳什平衡概念在进化均衡策略中的作用。根据上面第一个定义中给出的术语，此处要求对所有T≠S：
后来伯恩哈德·托马斯Bernhard Thomas在他的论文《On evolutionarily stable sets》中提出了更大胆的定义。它不同于纳什平衡概念在进化均衡策略中的作用。根据上面第一个定义中给出的术语，此处要求对所有T≠S：