What are all the smooth $S^1$-bundles over $\mathbb{C}\mathbb{P}^1$? i.e. What are all smooth manifolds so that $S^1\to X \to \mathbb {C}\mathbb{P}^1$ is a smooth fiber bundle?
Any suggestions will be helpful. Thanks in advance!
What are all the smooth $S^1$-bundles over $\mathbb{C}\mathbb{P}^1$? i.e. What are all smooth manifolds so that $S^1\to X \to \mathbb {C}\mathbb{P}^1$ is a smooth fiber bundle?
Any suggestions will be helpful. Thanks in advance!
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