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Hyperbolic entire functions and the Eremenko–Lyubich class: Class $$\mathcal {B}$$ B or not class $$\mathcal {B}$$ B ?
Hyperbolicity plays an important role in the study of dynamical systems, and is a key concept in the iteration of rational functions of one complex variable. Hyperbolic systems have also been considered in the study of transcendental entire functions. There does not appear to be an agreed definition of the …