On symbolic factors of $\mathcal{S}$-adic subshifts of finite topological rank

Abstract

This paper studies several aspects of symbolic factors of $\mathcal{S}$-adic subshifts of finite alphabet rank. First, we address a problem raised in [DDPM20] about the topological rank of symbolic factors of $\mathcal{S}$-adic subshifts and prove that this rank is at most the one of the extension system, improving results from [E20] and [GH2020]. As a consequence of our methods, we prove that finite topological rank systems are coalescent. Second, we investigate the structure of fibers ${\pi }^{-1}(y)$ of factor maps $\pi :(X,T)\to (Y,T)$ between minimal $\mathcal{S}$-adic subshifts of finite alphabet rank and show that they have the same finite cardinality for all $y$ in a residual subset of $Y$. Finally, we prove that the number of symbolic factors (up to conjugacy) of a fixed subshift of finite topological rank is finite, thus extending Durand's similar theorem on linearly recurrent subshifts.

Duplicate of arXiv:2008.13689

References in corpus (2)

• Orbit equivalence of Cantor minimal systems and their continuous spectra
• On the automorphism group of minimal S-adic subshifts of finite alphabet rank