Set of symbols
Alphabet
Deduction system
Theory
Zermelo-Fraenkel set theory
Set
Binary cartesian set product
Binary relation
Map
Function
Euclidean function
Basic function
Formulation 0
Let $[- \infty, \infty]$ be the D1275: Set of basic numbers.
A D18: Map $f : X \to Y$ is a basic function if and only if \begin{equation} Y \subseteq [- \infty, \infty] \end{equation}
Results
» R3586: Basic function is finite almost everywhere iff positive and negative parts are