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If $A$, $B$ are abelian groups such that $\mathrm{Hom}(A, G) \cong \mathrm{Hom}(B, G)$ for all abelian groups $G$, must $A$ and $B$ be isomorphic?

Jun 16, 2020

Is every smooth projective variety contained in a chain of smooth projective varieties of increasing dimension?

Aug 10, 2022

Is it possible to obtain the inequality $\|\nabla f\|_{L^{2p}} \leq C (\|f\|_{L^\infty} \|f\|_{W^{2, p}})^{1/2}$ from interpolation/harmonic analysis?

Jan 6, 2023

Looking for counterexamples: Are maximal tori in the automorphism groups of smooth complex quasiprojective varieties conjugate?

Feb 19

Does Peetre's theorem hold in complex analysis?

Nov 9, 2019

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Is the determinant line bundle of a coherent sheaf functorial (between sheaves of the same rank)?

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What's the point of fine sheaves? (As opposed to soft ones)

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Equivalent definitions of Kodaira dimension

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Looking for counterexamples: Are maximal tori in the automorphism groups of smooth complex quasiprojective varieties conjugate?

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