\begin{definition}[Definition:Number Theory/Also known as]
Older sources refer to '''number theory''' variously as:
:'''theory of numbers'''
:'''the higher arithmetic'''
:'''arithmetic'''.
{{AuthorRef|Carl Friedrich Gauss}} himself used the term '''arithmetic''', after the manner of the ancient Greeks.
'''Number theory''' can also be seen described by the fanciful name '''the Queen of Mathematics''' for various whimsical reasons.
\end{definition}