Noun
Dirichlet series (countable and uncountable, plural Dirichlet series)
(number theory) Any infinite series of the form
∑
n
=
1
∞
a
n
n
s
{\displaystyle \sum _{n=1}^{\infty }{\frac {a_{n}}{n^{s}}}}
, where
s
{\displaystyle s}
and each
a
n
{\displaystyle a_{n}}
are complex numbers.