\RealsThe symbol \Reals represents the set of all real numbers in mathematical notation. It is commonly used in mathematical expressions and equations to denote the real number system, which includes all rational and irrational numbers.
Indicates that x is a real number.
x \in \RealsA function f that maps real numbers to real numbers.
f: \Reals \to \RealsAn integral of a function f over the interval from 0 to 1, where f is a real-valued function.
\int_0^1 f(x) \, dx, \quad f: \Reals \to \Reals