Fig. 42.

(Color online) Fraction of cooperators $c$ in the population 1 as a function of $b$, for different values of the fraction $p$ of interpopulation contacts. The population 1 (of size $N_1={10}^3$) has been coupled to a smaller population 2 ($N_2={10}^2$). While initial strategies in population 1 are equally probable (random initial conditions), the population 2 starts from the absorbent state of fully defection. Other parameters are $r=0$, $ϵ=-0.4$. Both populations have a random (Erdős–Rényi) network of contacts with average degree $〈k〉=6$.

Reprinted figure with permission from Ref.  [349].

© 2014 by the American Physical Society.