i is the imaginary unit in general mathematical notation, but not in electrical engineering, where
i is already taken for denoting current. Hence electrical engineers tend to use
j as the notation for the imaginary unit. Which is correct depends on the field being discussed. Transfer functions are generally an engineering field (contrast with
Greens functions[?]) --
The Anome
Makes sense. --AxelBoldt
Removed "digital" from (digital) signal processing[?] - transfer functions are continuous as well as digital!
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