2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/159925Periodic-finite-type shifts (PFT's) form a class of sofic shifts that strictly contains the class of shifts of finite type (SFT's). In this paper, we investigate how the notion of "period" inherent in the definition of a PFT causes it to differ from an SFT, and how the period influences the properties of a PFT.revised version; 5 pages; to appear in the Proceedings of the 2008 IEEE International Symposium on Information Theory (ISIT'08), Toronto, CanadaInformation Theorytext