There are four possible ways to get chaos:

- Ignorance:this is labeled as "external influences". If you don't know what's happening than the result will be "surprising" and thus chaotic.
- Many simple systems interacting in space:you know well how the single system behaves but the overall result can be surprising and thus chaotic. The simplest case is cellular automata. In this case interaction in space is essential to have chaos .
- One single system developing in time:also here if the law is recursive than the result (after some time) can be surprising and thus chaotic. Time in this case is essential to get chaos.
- Use a quantum system like a radioactive material:the law is then intrinsically chaotic. There is no way to know when exactly a radiactive substance will decay.

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Maintained by Giuseppe Zito:Giuseppe.Zito@cern.ch: last update 28 Apr 97