The **logistic map** is a polynomial mapping (equivalently, recurrence relation) of degree 2, often cited as an archetypal example of how complex, chaotic behaviour can arise from very simple non-linear dynamical equations. The map was popularized in a seminal 1976 paper by the biologist Robert May,^{[1]} in part as a discrete-time demographic model analogous to the logistic equation first created by Pierre François Verhulst.^{[2]}Mathematically, the logistic map is written

http://en.m.wikipedia.org/wiki/Logistic_map

The **Rössler attractor** /ˈrɒslər/ is the attractor for the **Rössler system**, a system of three non-linear ordinary differential equations originally studied by Otto Rössler.^{[1]}^{[2]}These differential equations define a continuous-time dynamical system that exhibitschaotic dynamics associated with the fractal properties of the attractor.^{[3]}

http://en.wikipedia.org/wiki/R%C3%B6ssler_attractor

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