List questions from sheaf-theory

Published on 24 Mar 2013 - 15:44

557

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Some question of Hartshorne book Theorem III.2.7

Published on 25 Mar 2013 - 8:28

576

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Question about the sheaf of differentials of a fibre

Published on 31 Mar 2026 - 10:47

376

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Scheme theoretically, when the union of the interserction is the intersection of the union

Published on 26 Mar 2026 - 11:17

225

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Sheaf associated to a locally free presheaf of modules

Published on 04 Aug 2020 - 22:00

546

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Relationship between the ideal of an effective Cartier divisor and its invertible sheaf

Published on 25 Mar 2026 - 19:11

234

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Definition of a presheaf on a topological space with values in an abelian category

Published on 11 Aug 2020 - 18:56

50

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$\mathcal{O}_X$-modules at the generic fiber

Published on 13 Aug 2020 - 14:22

369

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Prime Spectrum of a ring: why is Geometry captured by local rings?

Published on 15 Aug 2020 - 18:57

596

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Understanding the definition of globally generated quasi-coherent sheaves

Published on 17 Aug 2020 - 15:43

142

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Index 1 Fano threefolds and Serre's construction

Published on 26 Mar 2026 - 17:52

123

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Restriction maps in definition of a subsheaf

Published on 22 Aug 2020 - 15:13

85

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Show that $j_{*}j^{-1}\mathcal{F}_{x}=\mathcal{F}_{x}$ if $x\in Z$ and $0$ otherwise, if $j:Z\rightarrow X$ is a closed subscheme of $X$

Published on 25 Aug 2020 - 18:03

58

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$\operatorname{Hom}_{\mathcal{A}}(\mathcal{M,N}) \simeq \operatorname{Hom}_{\mathcal{B}}(\mathcal{M} \otimes_{\mathcal{A}} \mathcal{B,N})$?

Published on 25 Aug 2020 - 22:49

102

Views

$H^i(X, \mathcal{O}_X(H))$ for $X$ a cubic fourfold

Published on 28 Mar 2026 - 8:42

List Question

Vanishing of local cohomology of constructible sheaves

Some question of Hartshorne book Theorem III.2.7

Question about the sheaf of differentials of a fibre

Scheme theoretically, when the union of the interserction is the intersection of the union

Sheaf associated to a locally free presheaf of modules

Relationship between the ideal of an effective Cartier divisor and its invertible sheaf

Definition of a presheaf on a topological space with values in an abelian category

$\mathcal{O}_X$-modules at the generic fiber

Prime Spectrum of a ring: why is Geometry captured by local rings?

Understanding the definition of globally generated quasi-coherent sheaves

Index 1 Fano threefolds and Serre's construction

Restriction maps in definition of a subsheaf

Show that $j_{*}j^{-1}\mathcal{F}_{x}=\mathcal{F}_{x}$ if $x\in Z$ and $0$ otherwise, if $j:Z\rightarrow X$ is a closed subscheme of $X$

$\operatorname{Hom}_{\mathcal{A}}(\mathcal{M,N}) \simeq \operatorname{Hom}_{\mathcal{B}}(\mathcal{M} \otimes_{\mathcal{A}} \mathcal{B,N})$?

$H^i(X, \mathcal{O}_X(H))$ for $X$ a cubic fourfold

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