Universal $β$-expansions

Details Universal $β$-expansions Universal $β$-expansions

2002-09-19

arxiv.org/abs/math/0209247v1

Mathematics

Dynamical Systems

11 pages

Scientific paper

Given $\beta\in(1,2)$, a $\beta$-expansion of a real $x$ is a power series in base $\beta$ with coefficients 0 and 1 whose sum equals $x$. The aim of this note is to study certain problems related to the universality and combinatorics of $\beta$-expansions. Our main result is that for any $\beta\in(1,2)$ and a.e. $x\in (0,1)$ there always exists a universal $\beta$-expansion of $x$ in the sense of Erd\"os and Komornik, i.e., a $\beta$-expansion whose complexity function is $2^n$. We also study some questions related to the points having less than a full branching continuum of $\beta$-expansions and also normal $\beta$-expansions.

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