Symbols:O/Little-O Notation

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Little-$\oo$ Notation


Used for example as follows in the context of sequences:

Let $g: \N \to \R$ be a real sequence, expressed here as a real-valued function on the set of natural numbers $\N$.

Then $\map \oo g$ is defined as:

$\map \oo g = \set {f: \N \to \R: \forall c \in \R_{>0}: \exists n_0 \in \N: \forall n > n_0: \size {\map f n} \le c \cdot \size {\map g n} }$

This is denoted:

$a_n = \map o {b_n}$

The $\LaTeX$ code for \(a_n = \map o {b_n}\) is a_n = \map o {b_n} .