Digital expansions with negative real bases

Details Digital expansions with negative real bases Digital expansions with negative real bases

2011-12-06

arxiv.org/abs/1112.1183v1

Mathematics

Dynamical Systems

Scientific paper

Similarly to Parry's characterization of $\beta$-expansions of real numbers in real bases $\beta > 1$, Ito and Sadahiro characterized digital expansions in negative bases, by the expansions of the endpoints of the fundamental interval. Parry also described the possible expansions of 1 in base $\beta > 1$. In the same vein, we characterize the sequences that occur as $(-\beta)$-expansion of $\frac{-\beta}{\beta+1}$ for some $\beta > 1$. These sequences also describe the itineraries of 1 by linear mod one transformations with negative slope.

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