Enable JavaScript to interact with content and submit forms on Wolfram websites. Learn how

Legacy Documentation

The Mathematical Explorer^TM (2001)

This is documentation for an obsolete product.

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