# Translations:Dictionary:Fourier transform/19/en

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The same rules for quadrants apply to γ_{n} as expressed for γ(*f*); *a*_{0} is the zero-frequency component (or dc shift). The frequency spectrum is discrete if the function is periodic. If *h*_{t} is a sampled time series sampled at intervals of time *t*_{2}, then we can stop summing when *n*>2*T*/*t*_{2} (see sampling theorem). In this case *a*_{n} and *b*_{n} can be expressed as sums: