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FilledSmallSquareRationals represents the domain of rational numbers, as in x Rationals.

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

FilledSmallSquareSimplify[expr Rationals] can be used to try to determine whether an expression corresponds to a rational number.

FilledSmallSquare The domain of integers is taken to be a subset of the domain of rationals.

FilledSmallSquareRationals is output in TraditionalForm as .

FilledSmallSquare See The Mathematica Book: Section 3.3.10.

FilledSmallSquare See also: Element, Simplify, Algebraics, Integers, Rational, Denominator.

Further Examples