Figure 3.

(a) Schematics for the existence of a unique branching point, i.e. an evolutionarily singular strategy that is convergence stable but not an ESS. Here, σ = 1 < (1 + ν_1,∞τ)/k so that the regime is as depicted in figure 2b, with ${\mathcal{B}}_1<{\alpha }_{1,\mathrm{\infty }}/\delta <{\mathcal{B}}_2$. Dark blue denotes the endemic strategy resisting mutant invasion, whereas light blue denotes mutant invading the endemic strategy. (b) Regions of mutual invasibility (depicted in red).