\begin{definition}[Definition:Class Bijection]
Let $A$ and $B$ be classes.
Let $f: A \to B$ be a class mapping from $A$ to $B$.
Then $f$ is said to be a '''class bijection''' {{iff}}:
:$f$ is both a class injection and a class surjection.
Category:Definitions/Class Mappings
\end{definition}