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Scale recurrence lemma and dimension formula for Cantor sets in the complex plane

Published online by Cambridge University Press:  25 March 2024

CARLOS GUSTAVO T. DE A. MOREIRA
Affiliation:
Instituto Nacional de Matematica Pura e Aplicada (IMPA), Rio de Janeiro, Brazil (e-mail: gugu@impa.br)
ALEX MAURICIO ZAMUDIO ESPINOSA*
Affiliation:
Universidade Federal Fluminense (UFF), Niterói, Brazil

Abstract

We prove a multidimensional conformal version of the scale recurrence lemma of Moreira and Yoccoz [Stable intersections of regular Cantor sets with large Hausdorff dimensions. Ann. of Math. (2) 154(1) (2001), 45–96] for Cantor sets in the complex plane. We then use this new recurrence lemma, together with Moreira’s ideas in [Geometric properties of images of Cartesian products of regular Cantor sets by differentiable real maps. Math. Z. 303 (2023), 3], to prove that under the right hypothesis for the Cantor sets $K_1,\ldots ,K_n$ and the function $h:\mathbb {C}^{n}\to \mathbb {R}^{l}$, the following formula holds:

$$ \begin{align*}HD(h(K_1\times K_2 \times \cdots\times K_n))=\min \{l,HD(K_1)+\cdots+HD(K_n)\}.\end{align*} $$

Type
Original Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press

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