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In this paper we prove some compactness theorems of families of proper holomorphic correspondences. In particular we extend the well known Wong-Rosay's theorem to proper holomorphic correspondences. This work generalizes some recent results proved in [17].

The purpose of this paper is to prove that proper holomorphic self-mappings of the minimal ball are biholomorphic. The proof uses the scaling technique applied at a singular point and relies on the fact that a proper holomorphic mapping f: D → Ω with branch locus $V_f$ is factored by automorphisms if and only if $f_{*}\left(\pi ₁(D\setminus f^{-1}\left(f\left(V_f\right)\right),x)\right)$ is a normal subgroup of $\pi ₁(\Omega \setminus f\left(V_f\right),b)$ for some $b\in \Omega \setminus f\left(V_f\right)$ and $x\in f^{-1}\left(b\right)$.

We describe the branch locus of proper holomorphic mappings between rigid polynomial domains in C. It appears, in particular, that it is controlled only by the first domain. As an application, we prove that proper holomorphic self-mappings between such domains are biholomorphic.