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