In the book "Foliations I" Candel & Conlon, the exercise 1.1.3 is as follow:
If $\partial M = \emptyset = \partial B$ and $B$ is connected, prove that the submersion $f:M\rightarrow B$ with compact level sets is a fiber bundle.
How to solve it?
2026-03-25 03:18:03.1774408683
Submersion with compact level sets is a fiber bundle
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