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什么时候微观假设决定了进化博弈动力学的结果?

When do microscopic assumptions determine the outcome in evolutionary game dynamics?

Bin Wu, Benedikt Bauer, Tobias Galla, Arne Traulsen

摘要:

有限种群中的进化博弈动力学模型需要确定策略如何传播的微观过程。这些过程的确切细节通常在没有进一步考虑的情况下选择。不同类型的微观模型,特别是包括基于适应度的选择规则和基于模仿的动态,经常被使用,好像它们是可互换的。我们挑战这一观点,并调查这些选择在微观层面上有多强大。专注于一个关键的宏观观察,一个单一的突变体接管野生型个体的人口的概率,我们表明,有一个独特的一对基于适应度的过程和模仿过程导致相同的结果,为任意游戏和所有强度的选择。这突出表明在微观一级作出任意选择而不考虑宏观一级后果的危险。

英文摘要:

The modelling of evolutionary game dynamics in finite populations requires microscopic processes that determine how strategies spread. The exact details of these processes are often chosen without much further consideration. Different types of microscopic models, including in particular fitness-based selection rules and imitation-based dynamics, are often used as if they were interchangeable. We challenge this view and investigate how robust these choices on the micro-level really are. Focusing on a key macroscopic observable, the probability for a single mutant to take over a population of wild-type individuals, we show that there is a unique pair of a fitness-based process and an imitation process leading to identical outcomes for arbitrary games and for all intensities of selection. This highlights the perils of making arbitrary choices at the micro-level without regard of the consequences at the macro-level.

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