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

FilledSmallSquarex Complexes evaluates immediately only if x is a numeric quantity.

FilledSmallSquareSimplify[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.

FilledSmallSquareComplexes is output in TraditionalForm as .

FilledSmallSquare See The Mathematica Book: Section 3.3.10.

FilledSmallSquare See also: Element, Simplify, NumberQ, NumericQ, Complex, Reals.

FilledSmallSquare Related package: Algebra`Quaternions`.