Definition:Big-O Notation/Notation

Notation for Big-$\OO$ Notation
The expression $\map f n \in \map \OO {\map g n}$ is read as:
 * $\map f n$ is big-O of $\map g n$

While it is correct and accurate to write:
 * $\map f n \in \map \OO {\map g n}$

it is a common abuse of notation to write:
 * $\map f n = \map \OO {\map g n}$

This notation offers some advantages.