Since is given by equations, we can interpret it as a map of complex manifolds.
It is especially popular in the context of complex manifolds.
It is a complex manifold of complex dimension 3g 3.
Often the space is a complex manifold and the group is a discrete group.
It follows from this definition that an almost complex manifold is even dimensional.
Let X be a complex algebraic manifold and a good compactification.
See complex differential form and almost complex manifold for applications of these ideas.
Note however that it is very hard to decide whether a complex manifold is kähler or not.
Similarly, the quaternionic analogs of these are also complex manifolds.
A complex manifold admitting a positive line bundle is kähler.