# Definition:O Notation/Big-O Notation/Also known as

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## Also denoted as

The big-$\OO$ notation, along with little-$\mathcal o$ notation, are also referred to as **Landau's symbols** or **the Landau symbols**, for Edmund Georg Hermann Landau.

In analytic number theory, sometimes **Vinogradov's notations** $f \ll g$ or $g \gg f$ are used to mean $f = \map \OO g$.

This can often be clearer for estimates leading to typographically complex error terms.

Some sources use an ordinary $O$:

- $f = \map O g$