Branched coverings of $C{P}^2$ and other basic 4-manifolds

Riccardo Piergallini, Daniele Zuddas

We give necessary and sufficient conditions for a 4-manifold to be a branched covering of $C{P}^2$, $S^2\times S^2$, $S^2\tilde{\times }{S}^2$ and $S^3\times S^1$, which are…