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The imaginary unit is one of the four units of the domain of complex numbers. (The others are 1, –1 and − i). In electrical engineering applications, the symbol j is generally used instead of i, which is then generally used as an iterator. The imaginary unit is
I in Wolfram Mathematica's InputForm and a blackboard bold lowercase I in StandardForm.
- ↑ Paul J. Nahin, An Imaginary Tale: The Story of . Princeton, New Jersey: Princeton University Press (1988): 125