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Mathematica® Teacher's Edition (2002)

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Reals

FilledSmallSquare Reals represents the domain of real numbers, as in x Reals.

FilledSmallSquare x Reals evaluates immediately only if x is a numeric quantity.
FilledSmallSquare Simplify[expr Reals] can be used to try to determine whether an expression corresponds to a real number.
FilledSmallSquare Within Simplify and similar functions, objects that satisfy inequalities are always assumed to be real.
FilledSmallSquare Reals is output in TraditionalForm as .
FilledSmallSquare See The Mathematica Book on the web: Section 1.4.6 and Section 3.3.10.
FilledSmallSquare See also: Element, Simplify, Real, Integers, Complexes, Algebraics, ComplexExpand, PowerExpand.