Periodicity, almost periodicity for time scales and related functions
Chao Wang, Ravi P. Agarwal, Donal O’Regan (2016)
Nonautonomous Dynamical Systems
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In this paper, we study almost periodic and changing-periodic time scales considered byWang and Agarwal in 2015. Some improvements of almost periodic time scales are made. Furthermore, we introduce a new concept of periodic time scales in which the invariance for a time scale is dependent on an translation direction. Also some new results on periodic and changing-periodic time scales are presented.