Conjecture on escaping sets in the Eremenko-Lyubich class

Let B\mathcal{B} denote the Eremenko-Lyubich class of transcendental entire functions whose set of singular values is bounded. For a transcendental entire function ff, let

I(f):={zC:fn(z) as n}I(f):= \{ z \in \mathbb{C}: f^n(z) \rightarrow \infty \text{ as } n \rightarrow \infty \}

be its escaping set. A connected set ECE\subset\mathbb{C} is a spider's web if there exists a sequence of bounded simply connected domains (Gn)nN(G_n)_{n\in\mathbb{N}} such that

GnE,GnGn+1,nNGn=C.\partial G_n \subset E, \quad G_n \subset G_{n+1}, \quad \bigcup_{n\in\mathbb{N}}G_n=\mathbb{C}.

Escaping-set conjecture. If fBf\in\mathcal{B} is a transcendental entire function, then I(f)I(f) is not a spider's web.

The paper proves this when ff has a finite logarithmic asymptotic value. The conjecture proposes that the same non-spider's-web conclusion holds for every transcendental entire function in the Eremenko-Lyubich class; its general status is not specified in the supplied text.

Sources & referencesView supporting material

Primary source

David J. Sixsmith, “Dynamical sets whose union with infinity is connected”, arXiv:1712.08375 (2017).

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