\begin{definition}[Definition:Conversion of Ratio]
Let $R = a : b$ be a ratio.
Then the '''conversion of $R$''' is the ratio $a : a - b$.
{{EuclidSaid}}
:''{{Definition:Euclid's Definitions - Book V/16 - Conversion of Ratio}}
{{EuclidDefRefNocat|V|16|Conversion of Ratio}}
Category:Definitions/Euclidean Algebra
\end{definition}