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We construct first a class of Moran fractals in R^d with countably many generators and non-stationary contraction rates; at each step n, the contractions depend on n-truncated sequences, and are related to asymptotic letter frequencies. In some cases the sets of contractions may be infinite at each step. We show that the Hausdorff dimension of such a fractal is equal to the zero h of a pressure function. We prove that the dimensions of these sets depend real analytically on the frequencies. Next, we apply the above construction to obtain non-stationary fractals E(x; f) \subset R^d, associated to f-expansions of real numbers x, and study the dependence of these fractals on x. We consider for instance beta-expansions, the continued fraction expansion and other f-expansions. By employing the Ergodic Theorem for invariant absolutely continuous measures and equilibrium measures, and using some probabilities for which the digits become independent random variables, we study the function x \to dim_H(E(x; f)) on the respective set of quasinormal numbers x \in [0; 1). We investigate also another class of fractals \tilde E_f (x) \subset R^d, for which both the non-stationary contraction vect

Author

Mihailescu, Eugen; Roychowdhury, Mrinal Kanti

Published

2013

Language

EN