List questions from sheaf-theory

Published on 19 Aug 2021 - 15:54

386

Views

"Retraction/sections" in Conceptual Mathematics

Published on 19 Aug 2021 - 22:09

67

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Is there a module of finite type but not quasi-coherent?

Published on 25 Aug 2021 - 11:59

253

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Does pushforward commute with tensor for coherent sheaves under an open immersion?

Published on 08 Apr 2026 - 4:15

206

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Ideal sheaf is quasi-coherent if and only if it is locally generated by sections

Published on 29 Aug 2021 - 12:24

394

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Conditions for quotient presheaf to be a sheaf

Published on 30 Aug 2021 - 7:28

403

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The stalk as a colimit

Published on 29 Mar 2026 - 7:36

267

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Presheaf kernel is a presheaf/sheaf

Published on 04 Sep 2021 - 22:11

82

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On kernels in the category of sets (more specifically, kernels of maps between stalks)

Published on 30 Mar 2026 - 0:22

96

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Left exactness of $-(U)$

Published on 06 Sep 2021 - 2:49

69

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Question regarding a section of a product of schemes

Published on 23 Feb 2026 - 11:56

58

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What is the minimal number of generators for $\mathcal{O}_{\mathbb{P}^n}(1)$?

Published on 26 Mar 2026 - 23:11

158

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meaning of sentence that a "presheaf/K-theory satisfies descent on a Grothendieck site"

Published on 25 Mar 2026 - 12:50

121

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Tensor Operations on free sheaves. Is sheafification necessary?

Published on 08 Sep 2021 - 21:21

241

Views

How should one think about presheaf or a sheaf?

Published on 13 Sep 2021 - 14:21

List Question

reference for differential $k$-forms being a sheaf on a manifold

"Retraction/sections" in Conceptual Mathematics

Is there a module of finite type but not quasi-coherent?

Does pushforward commute with tensor for coherent sheaves under an open immersion?

Ideal sheaf is quasi-coherent if and only if it is locally generated by sections

Conditions for quotient presheaf to be a sheaf

The stalk as a colimit

Presheaf kernel is a presheaf/sheaf

On kernels in the category of sets (more specifically, kernels of maps between stalks)

Left exactness of $-(U)$

Question regarding a section of a product of schemes

What is the minimal number of generators for $\mathcal{O}_{\mathbb{P}^n}(1)$?

meaning of sentence that a "presheaf/K-theory satisfies descent on a Grothendieck site"

Tensor Operations on free sheaves. Is sheafification necessary?

How should one think about presheaf or a sheaf?

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