Periodicity as the abstract concept of events occurring at regular time intervals is important in modeling nature, life and man-made objects. Its importance lies in predictability of events in science and technology. Problems with identification an analysis of periodicity, periodical solutions of differential and difference equations are included. One of the most important tools in investigating periodicity is the theory of Fourier series. Only a rather formal description is covered here without dealing with the theory of convergence of Fourier series.
KeywordsPeriodic Solution Fourier Series Periodic Function Trigonometric Polynomial Linear Difference Equation
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