(also known as FOURIER analysis, or FOURIER transform and spectral analysis).
"In theory, any waveform can be described as the sum of sine waves, but in practice, the method becomes infinitely cumbersome for impulse type functions". Moreover: "The language of frequency analysis has a "blind spot" for the concept of "sudden change" (i.e., discontinuous) (D. Mac KAY, 1969, p.113).
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Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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