Seminari del Dipartimento di Matematica

Seminario del 2021

Alessandro Della Corte (Università di Camerino)

The simplest erasing substitution

nell'ambito della serie: DINAMICI: ANOTHER INTERNET SEMINAR

sistemi dinamici

The symbolic action of a substitution on the binary expansion generates naturally an interval map. In case of erasing substitutions, the map is typically Baire-1 and not Darboux. As a model case, we consider what is arguably the simplest erasing substitution, mapping 0s to the empty word and 1s to 0 or 1 depending on the parity. The corresponding interval map is shown to have fractal properties (bounds are given on the Hausdorff dimension of the fibers) and to display rich dynamical behavior, including Devaney chaos, uniform distributional chaos of type 1, infinite topological entropy as well as the presence of cycles attracting in a finite time every rational.