A chaotic attractor of a Rössler system for suitable parameter values. Local expansion near an unstable spiral combines with excursions in the third coordinate and global return; the existence of a local expanding direction by itself does not prove a chaotic attractor.
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The Rössler attractor is a chaotic attractor named after the German physicist Otto Rössler, who introduced it in 1976. It is a system of three non-linear ordinary differential equations that model certain dynamical systems, and it is notable for its relatively simple structure compared to other chaotic systems like the Lorenz attractor. The equations that define the Rössler attractor are: 1. \(\frac{dx}{dt} = -y - z\) 2.