\begin{definition}[Definition:Prosthaphaeresis/Logarithms]
The logarithmic technique of prosthaphaeresis is based on the rule of the Sum of Logarithms:
:$\log_b x y = \log_b x + \log_b y$
Any base $b$ can be used.
The original tecnhique used Napierian logarithms where the base was $0.9999999$
In due course the common (base $10$) logarithm was used, as developed by {{AuthorRef|Henry Briggs}}, called Briggsian logarithms.
\end{definition}