Super-Poincaré algebra

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A harmonic spectrum is a spectrum containing only frequency components whose frequencies are whole number multiples of the fundamental frequency; such frequencies are known as harmonics.

In other words, if ω is the fundamental frequency, then a harmonic spectrum has the form

{,2ω,ω,0,ω,2ω,}.

A standard result of Fourier analysis is that a function has a harmonic spectrum if and only if it is periodic.

See also

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