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The limits of weak selection and large population size in evolutionary game theory. (English) Zbl 1378.91029
Summary: Evolutionary game theory is a mathematical approach to studying how social behaviors evolve. In many recent works, evolutionary competition between strategies is modeled as a stochastic process in a finite population. In this context, two limits are both mathematically convenient and biologically relevant: weak selection and large population size. These limits can be combined in different ways, leading to potentially different results. We consider two orderings: the $$wN$$ limit, in which weak selection is applied before the large population limit, and the $$Nw$$ limit, in which the order is reversed. Formal mathematical definitions of the $$Nw$$ and $$wN$$ limits are provided. Applying these definitions to the Moran process of evolutionary game theory, we obtain asymptotic expressions for fixation probability and conditions for success in these limits. We find that the asymptotic expressions for fixation probability, and the conditions for a strategy to be favored over a neutral mutation, are different in the $$Nw$$ and $$wN$$ limits. However, the ordering of limits does not affect the conditions for one strategy to be favored over another.

MSC:
 91A22 Evolutionary games 92D15 Problems related to evolution 60J20 Applications of Markov chains and discrete-time Markov processes on general state spaces (social mobility, learning theory, industrial processes, etc.)
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