Twist maps are maps on the 2dimensional torus of the form

Download the free software
chirikov.tgz as a 86 K
gziped tar ball. chirikov
is a simple program to explore the phase space or compute the
entropy of such maps.
Check out the
documentation.
chirikov was used to produce pictures and animations in the
showroom.

If f(x)=g sin(x), the map is called the Chirikov Standard map.
All measurements indicate that the entropy of this map
is bounded below by log(g/2).
Make your own experiment in the
entropy laboratory.

You can also explore the phase space with a
Java applet .

The animated torus creature below is
Twistie
the mascot.

Some more information can be found on the
slides or
link page.
