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Obliv
2:21 PM
$\nabla$ is a math thing too right? Do people write $\nabla$ or $\vec{\nabla}$? Which is more standard?
Thorgott
circle bundles are classified by their Euler class over any reasonable space
where I guess reasonable should mean "paracompact, Hausdorff and has the homotopy type of a CW-complex"
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