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Branched coverings of $CP^2$ and other basic 4-manifolds. (arXiv:1707.03667v3 [math.GT] UPDATED)

来源于:arXiv
We give necessary and sufficient conditions for a 4-manifold to be a branched covering of $CP^2$, $S^2\times S^2$, $S^2 \mathbin{\tilde\times} S^2$ and $S^3 \times S^1$, which are expressed in terms of the Betti numbers and the intersection form of the 4-manifold. 查看全文>>