Normality conjecture for self-similar measures

Let {φi(x)=λix+ti}iI\{\varphi_i(x)=\lambda_i x+t_i\}_{i\in \mathcal{I}} be an iterated function system of contracting similarities, and let b2b\geq 2 be an integer. Suppose that

logblogλiQ\frac{\log b}{\log |\lambda_i|}\notin\mathbb{Q}

for some iIi\in\mathcal{I}. A point xx is normal in base bb if every finite block of base-bb digits occurs in its expansion with the expected limiting frequency. Normality conjecture. Almost every xx is normal in base bb with respect to any non-atomic fully supported self-similar measure of {φi}iI\{\varphi_i\}_{i\in\mathcal{I}}. The conjecture is false without the stated irrationality assumption on the contraction ratio; thus the claim as stated is refuted, although the version under the irrationality hypothesis is the asserted result of interest.

Sources & referencesView supporting material

Primary source

Simon Baker, “On normal numbers and self-similar measures”, arXiv:2107.02699 (2021).

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