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Mathematica® Teacher's Edition (2002)

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Complexes

FilledSmallSquare Complexes represents the domain of complex numbers, as in x Complexes.

FilledSmallSquare x Complexes evaluates immediately only if x is a numeric quantity.
FilledSmallSquare Simplify[expr Complexes] can be used to try to determine whether an expression corresponds to a complex number.
FilledSmallSquare The domain of real numbers is taken to be a subset of the domain of complex numbers.
FilledSmallSquare Complexes is output in TraditionalForm as .
FilledSmallSquare See The Mathematica Book on the web: Section 3.3.10.
FilledSmallSquare See also: Element, Simplify, NumberQ, NumericQ, Complex, Reals.