Conjecture on fractal-like and fractal-unlike chaotic trajectories

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Let

fα,β,γ,δ(z)=αz+βγz2+δzf_{\alpha,\beta,\gamma,\delta}(z)=\frac{\alpha z+\beta}{\gamma z^2+\delta z}

be the rational map associated with parameters α\alpha, β\beta, γ\gamma, and δ\delta. A chaotic trajectory is called fractal-like or fractal-unlike according to the observed geometric behavior. Fractal-trajectory conjecture. The chaotic trajectories of fα,β,γ,δf_{\alpha,\beta,\gamma,\delta} are fractal-like only if

∣α∣<∣γ∣,∣β∣<∣δ∣,∣α+β∣<∣γ+δ∣,|\alpha|<|\gamma|,\qquad |\beta|<|\delta|,\qquad |\alpha+\beta|<|\gamma+\delta|,

and fractal-unlike only if

∣α∣>∣γ∣,∣β∣>∣δ∣,∣α+β∣>∣γ+δ∣.|\alpha|>|\gamma|,\qquad |\beta|>|\delta|,\qquad |\alpha+\beta|>|\gamma+\delta|.

The claim is based on computational observations of chaotic trajectories and a further sample of 500 trajectories; it is not accompanied by a proof in the supplied text.

References

Primary source

Sk. Sarif Hassan, “Computational Complex Dynamics of f_α, β, γ, δ(z)=αz + βγz^2 +δz”, arXiv:1603.00007 (2016).

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