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.
@article{bwmeta1.element.doi-10_1515_msds-2016-0003, author = {Chao Wang and Ravi P. Agarwal and Donal O'Regan}, title = {Periodicity, almost periodicity for time scales and related functions}, journal = {Nonautonomous Dynamical Systems}, volume = {3}, year = {2016}, pages = {24-41}, zbl = {1342.26067}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_1515_msds-2016-0003} }
Chao Wang; Ravi P. Agarwal; Donal O’Regan. Periodicity, almost periodicity for time scales and related functions. Nonautonomous Dynamical Systems, Tome 3 (2016) pp. 24-41. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_1515_msds-2016-0003/
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