Reaalväärtused
Reaalväärtused refer to values that belong to the set of real numbers, denoted by R. In mathematics, an object is called real-valued if its outputs lie in R. The most common context is real-valued functions, where a function f maps elements from a domain X to real numbers, written as f: X → R, and for every input x, the value f(x) is a real number.
Examples include f(x) = x^2 for x ∈ R, where f(3) = 9, a real value; and f(x) = sin(x)
Real-valued is often contrasted with complex-valued or vector-valued. A complex-valued function, for example, has outputs in
In practice, statements about real-valued functions emphasize properties and operations that remain within the real numbers,