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Fallen Apart
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55
What are the open subsets of $\mathbb{R}^n$ that are diffeomorphic to $\mathbb{R}^n$
42
Are there other kinds of bump functions than $e^\frac1{x^2-1}$?
25
Prove that the Lie derivative of a vector field equals the Lie bracket: $\frac{d}{dt} ((\phi_{-t})_* Y)|_{t=0} = [X,Y]$
22
What follows from Axiom of Dependent Choice (DC) and what doesn't?
16
Where was $I_x/I_x^2$ first introduced? (DG or AG)