Otto Rössler introduced a simple continuous-time model of deterministic chaos in 1976. The Rössler system is commonly written
Only the product is nonlinear. Nevertheless, suitable parameters produce the folding and stretching associated with the Rössler attractor.[ref]
The example makes an important modelling point: a small number of equations and nonlinear terms can generate complicated motion. The existence of a chaotic regime does not imply that every parameter choice or every initial condition in the model is chaotic.

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Otto Rössler is a German theoretical biochemist and physicist, known for his work in the fields of chaos theory, systems theory, and the philosophy of science. He is particularly recognized for his contributions to the study of dynamical systems and has proposed models related to chaos and complexity in biological and physical systems. Rössler is also known for his work on the Rössler attractor, a system of equations that exhibits chaotic behavior and has become a fundamental example in chaos theory.