We have already looked at iterations of linear functions, so a natural extension would be to look at quadratic functions in the form $f(x)=ax(x-1)$. There are some familiar questions, such as what happens when $a$ is varied with a fixed $x_0$ and vice versa.

There is a little twist, though. Iteration around a fixed may cause nearby points to converge towards that fixed point. That point is then called an *attractor. *Nearby points could also diverge away from the fixed point. If so, the point is then called a *repeller.* Sometimes there is no pattern at all and can look quite chaotic……..

Chaos will be looked at and that is the major draw for me to consider this chapter. Let’s have some random fun!!!