In mathematics, the Dedekind eta function, named after Richard Dedekind, is a modular form of weight 1/2 and is a function defined on the upper half-plane of complex numbers, where the imaginary part is positive.
== Definition ==
For any complex number
τ
{\displaystyle \tau }
with
I
m
(
τ
)
>
0
{\displaystyle Im(\tau )>0}
, let
q
=
e
2
π
i
τ
...