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Taken together they form what is described as a Dirac comb, in this case in the frequency domain.
This link between a Dirac comb in the frequency domain and a corresponding Dirac comb in the time domain means that if ever we observe a set of harmonics in some natural process there must inevitably be some form of sampling process taking place in the time domain and vice versa.
(ii) The right-hand side of (13) may be interpreted as a weighted Dirac comb or III-function.
Finally, we considered univariate splines of complex order as solutions Of certain linear fractional differential operators and a Dirac comb series.