\begin{ccRefConcept}{Kernel::RT}

A number type representing ring elements, i.e., must be closed under
operations $+$, $-$, and $*$. A division operation is required only
for those cases where the remainder is zero.

\ccRefines
\ccc{CopyConstructable}, \ccc{Assignable}\\ 
\ccc{NumberType}
\end{ccRefConcept}