Definition:Formal Product of Dirichlet Series
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Definition
Let $f, g : \N \to \C$ be arithmetic functions.
Let $F, G$ be their formal Dirichlet series.
The formal product of $F$ and $G$ is the formal Dirichlet series:
- $\ds \sum_{n \mathop = 1}^\infty \frac {\map {\paren {f * g} } n} {n^s}$
where $*$ denotes Dirichlet convolution.