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21 - Hausdorff and Packing Measures of Compactly Nonrecurrent Regular Elliptic Functions

from Part VI - Compactly Nonrecurrent Elliptic Functions: Fractal Geometry, Stochastic Properties, and Rigidity

Published online by Cambridge University Press:  20 April 2023

Janina Kotus
Affiliation:
Warsaw University of Technology
Mariusz Urbański
Affiliation:
University of North Texas
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Summary

The results of the previous chapter are not the last word about Sullivan conformal measures. Left alone, these measures would be a kind of curiosity. Their true power, meaning, and importance come from their geometric characterizations and their usefulness, one could even say indispensability, in understanding geometric measures on Julia sets, i.e., their Hausdorff and packing $h$-dimensional measures, where, we recall, $h=\HD(J(f))$. This is fully achieved in the present chapter. Having said that, this chapter can be viewed from two perspectives. The first is that we provide therein a geometrical characterization of the $h$-conformal measure $m_h$, which, with the absence of parabolic points, turns out to be a normalized packing measure, and the second is that we give a complete description of geometric, Hausdorff, and packing measures of the Julia sets $J(f)$. Owing to the fact that the Hausdorff dimension of the Julia set of an elliptic function is strictly larger than $1$, this picture is even simpler than for nonrecurrent rational functions.

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Meromorphic Dynamics
Elliptic Functions with an Introduction to the Dynamics of Meromorphic Functions
, pp. 335 - 347
Publisher: Cambridge University Press
Print publication year: 2023

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