Received 21 November 2006; received in revised form 16 January 2007; accepted 18 January 2007

Ref: J. C. Sprott, Phys. Lett. A **366**,
397-402 (2007)

The complete paper is available in PDF format.

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Fig. 1. Variation of Lyapunov exponents, Kaplan-Yorke dimension, Kolmogorov-Sinai entropy, and local maximum of x with time delay tau.

Fig. 2. Plots of x(t) versus x(t - tau) for increasing tau showing the growth of the limit cycle, period doubling, and the onset of chaos at tau ~ 5.

Fig. 3. Return maps (modulo 2pi) for increasing tau showing the increasing complexity of the attractor beyond the onset of chaos at tau ~ 5.

Fig. 4. Time history of x,
x_{tau}, and dx/dt for tau = 20 showing Brownian
motion.

Fig. 5. Probability distribution function of x for 5 × 10^{5}
initial conditions near the origin after a time of 4 × 10^{3}
with tau = 20. The red curve is a Gaussian distribution with the same
standard deviation and area.

Fig. 6. Standard deviation of 5 × 10^{5} trajectories
starting near the origin versus time for tau = 20.