Let $M,N$ be two Compact Complex Surfaces (compact complex manifolds of complex dimension $2$).
Let $A$ be a (non-empty) subset of $M$ (not necessarily a sub-manifold).
Let $f: M \longrightarrow N$ be a map satisfying the following conditions:
- $f$ is Holomorphic;
- $f$ is Proper (the inverse image of a compact set is compact as well);
- $f$ is not, unfortunately, Submersion;
- $f(A)$ is a Finite subset of $N$;
- $f: M \setminus A \longrightarrow N\setminus f(A)$ is a Diffeomorphism (or even a Bi-Holomorphic).
Let $T$ be a (non-trivial) $(1,1)$ Current on the surface $N$.
Under the assumption above
Can the current $T$ (on the surface $N$) be pulled-back by the map $f$ to a current on the surface $M$?
The third condition (the map $f$ is not submersion) has, indeed, a non-trivial crucial effect. Otherwise, it is possible to define a current $T^*$ on the surface $M$ as follows $$T^*(\theta):=T(f_*(\theta))$$ where $\theta$ is a $(1,1)$ differential form on the surface $M$.