Question

Cech cohomology does not compute étale cohomology - Explanation of an example

score 159 · Answer 1 · 2026-03-25 06:04:18

159

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Cech cohomology does not compute étale cohomology - Explanation of an example

Published on 25 Mar 2026 - 6:04

score 996 · Answer 2 · 2019-01-07 18:57:50

996

Views

Criterion for showing that a morphism of schemes is an isomorphism

Published on 07 Jan 2019 - 18:57

score 85 · Answer 3 · 2026-03-25 01:17:08

85

Views

Why is there a correspondence between $ |\text{Proj}\;S| - V(f) $ and $ \text{Spec}\; (S_{f})_{0}$?

Published on 25 Mar 2026 - 1:17

score 1k · Answer 4 · 2026-03-25 03:00:30

1k

Views

Affine charts are dense in projective space

Published on 25 Mar 2026 - 3:00

score 278 · Answer 5 · 2026-03-26 14:23:01

278

Views

Clarification on a proof that the rank of a locally free sheaf is the same everywhere if $X$ is connected.

Published on 26 Mar 2026 - 14:23

score 199 · Answer 6 · 2026-03-25 06:10:15

199

Views

Constructing an invertible sheaf from a Cartier divisor?

Published on 25 Mar 2026 - 6:10

score 56 · Answer 7 · 2019-01-16 20:57:20

56

Views

Dimension of a closed subset and transcendental degree

Published on 16 Jan 2019 - 20:57

score 376 · Answer 8 · 2026-03-25 03:04:04

376

Views

Hypersurfaces of degree $d$ in $\mathbb{P}^n_k$ that contain a given closed $X$

Published on 25 Mar 2026 - 3:04

score 2.3k · Answer 9 · 2026-02-23 01:25:07

2.3k

Views

Is the pull-back of the structure sheaf the structure sheaf?

Published on 23 Feb 2026 - 1:25

score 108 · Answer 10 · 2019-01-21 19:17:00

108

Views

Motivation for Smoothness and Regularity of Schemes

Published on 21 Jan 2019 - 19:17

score 478 · Answer 11 · 2019-01-21 21:55:12

478

Views

Tangent space of a scheme and subschemes of length two

Published on 21 Jan 2019 - 21:55

score 103 · Answer 12 · 2019-01-22 09:02:20

103

Views

How to understand the closure of a point?

Published on 22 Jan 2019 - 9:02

score 85 · Answer 13 · 2026-03-25 04:43:41

85

Views

Families of genus zero curves vs Family of deformations of $\mathbb{P}_k^1$.

Published on 25 Mar 2026 - 4:43

score 782 · Answer 14 · 2026-03-25 09:30:04

782

Views

The kernel of a morphism of quasi-coherent sheaves on a scheme $(X,\mathcal{O}_X)$ is quasi-coherent.

Published on 25 Mar 2026 - 9:30

score 659 · Answer 15 · 2026-03-25 03:02:50

659

Views

Multiplicity and degree of irreducible projective subschemes.

Published on 25 Mar 2026 - 3:02

List Question

Cech cohomology does not compute étale cohomology - Explanation of an example

Criterion for showing that a morphism of schemes is an isomorphism

Why is there a correspondence between $ |\text{Proj}\;S| - V(f) $ and $ \text{Spec}\; (S_{f})_{0}$?

Affine charts are dense in projective space

Clarification on a proof that the rank of a locally free sheaf is the same everywhere if $X$ is connected.

Constructing an invertible sheaf from a Cartier divisor?

Dimension of a closed subset and transcendental degree

Hypersurfaces of degree $d$ in $\mathbb{P}^n_k$ that contain a given closed $X$

Is the pull-back of the structure sheaf the structure sheaf?

Motivation for Smoothness and Regularity of Schemes

Tangent space of a scheme and subschemes of length two

How to understand the closure of a point?

Families of genus zero curves vs Family of deformations of $\mathbb{P}_k^1$.

The kernel of a morphism of quasi-coherent sheaves on a scheme $(X,\mathcal{O}_X)$ is quasi-coherent.

Multiplicity and degree of irreducible projective subschemes.

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