List questions from sheaf-cohomology

467

Views

When can the sheaf cohomology of a quasi-coherent sheaf be computed in the category of quasi-coherent sheaves?

Published on 27 Mar 2026 - 5:41

60

Views

Explicit description of the elements of a local system

Published on 13 Nov 2020 - 5:02

144

Views

Indecomposability and $\mu$-stability for vector bundles

Published on 26 Mar 2026 - 19:37

72

Views

Computing $\mathcal{Ext}^1(\mathcal{O}_L, \mathcal{O}_\mathbb{P^2})$ (edited)

Published on 16 Nov 2020 - 7:20

251

Views

Wrong solution in Hartshorne exercise III.2.7

Published on 28 Nov 2020 - 9:58

122

Views

How are (pre)sheaves even well-defined on sites?

Published on 27 Mar 2026 - 6:17

104

Views

Superfluous assumptions on Vietoris-Begle mapping theorem in Iversen's Cohomology of Sheaves

Published on 27 Mar 2026 - 7:16

414

Views

Is Hartshorne's Remark III.2.9.1 actually a valid argument?

Published on 10 Dec 2020 - 3:44

189

Views

Description of Euler Characteristic Using $\operatorname{Ext}^i$'s

Published on 26 Mar 2026 - 7:58

557

Views

Exactness and obstruction in sheaf cohomology

Published on 14 Dec 2020 - 17:19

63

Views

Spectral sequence from resolution

Published on 17 Dec 2020 - 20:03

123

Views

Cohomology of doubly pinched torus via spectral sequences

Published on 26 Mar 2026 - 20:44

327

Views

Sheaf cohomology of the structure sheaf of the grasmannian G(2,7)

Published on 16 Jan 2021 - 15:43

135

Views

Calabi-Yau conditions for a threefold in the Grassmannian $Gr(2,7)$

Published on 27 Mar 2026 - 16:09

213

Views

Semisimple perverse sheaf?

Published on 17 Jan 2021 - 13:09

List Question

When can the sheaf cohomology of a quasi-coherent sheaf be computed in the category of quasi-coherent sheaves?

Explicit description of the elements of a local system

Indecomposability and $\mu$-stability for vector bundles

Computing $\mathcal{Ext}^1(\mathcal{O}_L, \mathcal{O}_\mathbb{P^2})$ (edited)

Wrong solution in Hartshorne exercise III.2.7

How are (pre)sheaves even well-defined on sites?

Superfluous assumptions on Vietoris-Begle mapping theorem in Iversen's Cohomology of Sheaves

Is Hartshorne's Remark III.2.9.1 actually a valid argument?

Description of Euler Characteristic Using $\operatorname{Ext}^i$'s

Exactness and obstruction in sheaf cohomology

Spectral sequence from resolution

Cohomology of doubly pinched torus via spectral sequences

Sheaf cohomology of the structure sheaf of the grasmannian G(2,7)

Calabi-Yau conditions for a threefold in the Grassmannian $Gr(2,7)$

Semisimple perverse sheaf?

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