2023/07/20 by Felipe Arbulú, Fabien Durand, Arbulú, Felipe +4
Computer Science · Mathematics · #Cellular Automata and Applications #Combinatorics #Computer science #Discrete mathematics #Ergodic theory #Ergodicity #Mathematical Dynamics and Fractals #Mathematics #Physics #Pure mathematics #Quantum mechanics #Spectrum (functional analysis) #Substitution (logic) #Toeplitz matrix #semigroups and automata theory
paper · pdf · doi:10.3934/dcds.2024052
openalex publication_date 2024/01/01 · openalex created_date 2024/01/14 · openalex updated_date 2026/08/01
In the light of recent developments of the S -adic study of subshifts, we revisit, within this framework, a well-known result on Toeplitz subshifts due to Jacobs–Keane giving a sufficient combinatorial condition to ensure discrete spectrum. We show that the notion of coincidences, originally introduced in the ' 70 s for the study of the discrete spectrum of substitution subshifts, together with the S -adic structure of the subshift allow to go deeper in the study of Toeplitz subshifts. We characterize spectral properties of the factor maps onto the maximal equicontinuous topological factors by means of coincidences density. We also provide an easy to check necessary and sufficient condition to ensure unique ergodicity for constant length S -adic subshifts.