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 = 3. It is shown that f a always exhibits a discontinuous steplike structure for each initial composition f a 0, and the number of plateaux is related with the value of f a 0.