ThmDex – An index of mathematical definitions, results, and conjectures.
Formulation F1340 on D4364: Real function
F1340
Formulation 0
Let $\mathbb{R}$ be the D282: Set of real numbers.
A D18: Map $f : X \to Y$ is a real function if and only if \begin{equation} Y \subseteq \mathbb{R} \end{equation}