- #1
Niles
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Homework Statement
Hi all.
I am given the following discrete mapping: [itex]x_{n+1}=f(x_n)=x_n+r-x_n^2[/itex] for r>0.
Objective: Find the r, where a period doubling takes occurs.
Attempt: First I find the fixed points: These are [itex]x=-\sqrt{r}[/itex] (which is unstable for all r) and [itex]x=\sqrt{r}[/itex] (which is stable for 0<r<1).
This is where I am stuck. I thought that I could find the r, where the first period-2 cycle occurs, but I do not think this is a period doubling. In that case I should find out when the period-4 cycle occurs, which seems like a long task (surely there must be an easier way).
Can you shed some light on this?
Thanks for helping.
Niles.