Natural extensions and entropy of $α$-continued fractions

Details Natural extensions and entropy of $α$-continued fractions Natural extensions and entropy of $α$-continued fractions

2010-11-18

arxiv.org/abs/1011.4283v2

Mathematics

Dynamical Systems

Scientific paper

We construct a natural extension for each of Nakada's $\alpha$-continued fractions and show the continuity as a function of $\alpha$ of both the entropy and the measure of the natural extension domain with respect to the density function $(1+xy)^{-2}$. In particular, we show that, for all $0 < \alpha \le 1$, the product of the entropy with the measure of the domain equals $\pi^2/6$. As a key step, we give the explicit relationship between the $\alpha$-expansion of $\alpha-1$ and of $\alpha$.

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