Figure 2.
The state space of a game involving the four strategies [OC, N], [OC, R], [OD, N] and [OD, R]. The corners of the three-dimensional simplex correspond to the homogeneous populations using that strategy, the interior points denote mixed populations. For each initial state, the evolution of the system is restricted to a two-dimensional saddle-like manifold that can be represented by a square (right). If μ < (γ/b), the competition between these four strategies is characterized by a rock–paper–scissors-like dynamics, as indicated by the orientation of the edges.