Rationals represents the domain of rational numbers, as in x Rationals.
x Rationals evaluates immediately only if x is a numeric quantity.
Simplify[expr Rationals] can be used to try to determine whether an expression corresponds to a rational number.
The domain of integers is taken to be a subset of the domain of rationals.
Rationals is output in TraditionalForm as .
See The Mathematica Book: Section 3.3.10.
See also: Element, Simplify, Algebraics, Integers, Rational, Denominator.
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