J. C. Sprott
Department of Physics, University of Wisconsin, Madison, WI 53706, USA
(Received 21 August 2001: received in revised form 2 November 2001; accepted 2 November 2001)
Ref: H. P. W. Gottlieb and J. C. Sprott, Phys. Lett. A 291, 385-388 (2001)
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Fig. 1. Largest Lyapunov exponent lambda versus driving angular
frequency omega for Eq. (1) with p=3.
Fig. 2. Poincaré section in the x-dx/dt plane for
case of Eq. (1), for omega t mod 2pi=0.
Fig. 3. As for Fig. 1, but with p=5.
Fig. 4. Largest positive Lyapunov exponent for arbitrary p and
in Eq. (1), shown on a grey scale--blacker
tone for larger exponent.