4.I.6B

Mathematical Biology
Part II, 2007

The non-dimensional equations for two competing populations are

dudt=u(1v)ϵ1u2dvdt=α[v(1u)ϵ2v2]\begin{aligned} &\frac{d u}{d t}=u(1-v)-\epsilon_{1} u^{2} \\ &\frac{d v}{d t}=\alpha\left[v(1-u)-\epsilon_{2} v^{2}\right] \end{aligned}

Explain the meaning of each term in these equations.

Find all the fixed points of this system when α>0,0<ϵ1<1\alpha>0,0<\epsilon_{1}<1 and 0<ϵ2<10<\epsilon_{2}<1, and investigate their stability.