Paper 4, Section II, D

Dynamical Systems | Part II, 2010

Let I=[0,1]I=[0,1] and consider continuous maps F:I→IF: I \rightarrow I. Give an informal outline description of the two different bifurcations of fixed points of FF that can occur.

Illustrate your discussion by considering in detail the logistic map

F(x)=μx(1−x),F(x)=\mu x(1-x),

for μ∈(0,1+6]\mu \in(0,1+\sqrt{6}].

Describe qualitatively what happens for μ∈(1+6,4]\mu \in(1+\sqrt{6}, 4].

[You may assume without proof that

x−F2(x)=x(μx−μ+1)(μ2x2−μ(μ+1)x+μ+1)x-F^{2}(x)=x(\mu x-\mu+1)\left(\mu^{2} x^{2}-\mu(\mu+1) x+\mu+1\right)

Typos? Please submit corrections to this page on GitHub.