= Edward Ott
{c}
<Edward Ott> helped show that an attractor's geometry and its sensitivity to perturbations are separate properties. With <Celso Grebogi>, <Steven Pelikan> and <James A. Yorke>, he constructed examples of <strange nonchaotic attractors> in 1984.<Strange attractors that are not chaotic by Celso Grebogi and others>[Construction and Lyapunov-exponent analysis]{ref}
The attractor can have an irregular, fractal structure without a positive <Lyapunov exponent> indicating exponential separation. In the quasiperiodically driven construction, the drive has a neutral direction while transverse contraction can remain negative. Visual complexity therefore does not by itself establish dynamical chaos.
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