Spatial snowdrift game in heterogeneous agent systems with co-evolutionary strategies and updating rules*
Xia Hai-Jiang, Li Ping-Ping, Ke Jian-Hong†, Lin Zhen-Quan
       
The equilibrium composition f a versus the cost-to-benefit ratio r at ν T = 36. Each f a exhibits a discontinuous steplike structure for each initial composition f a 0, and the number of plateaux has relation with the value of f a 0. Especially, f a ≃ f a 0 for f a 0 = 0 in the range of 1/3 < r < 1/2, and it is also the case for f a 0 = 0.1 in the range of 1/3 < r < 2/5.