Question

How can I work out the hopf-algebra action corresponding to a group action on an affine scheme?

score 71 · Answer 1 · 2026-03-25 04:41:33

71

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How can I work out the hopf-algebra action corresponding to a group action on an affine scheme?

Published on 25 Mar 2026 - 4:41

score 210 · Answer 2 · 2017-03-13 22:28:12

210

Views

examples of schemes other than $\text{spec} R$?

Published on 13 Mar 2017 - 22:28

score 439 · Answer 3 · 2017-03-16 07:11:29

439

Views

Manifold $M$ and affine scheme $\text{Spec}(C^\infty(M))$.

Published on 16 Mar 2017 - 7:11

score 319 · Answer 4 · 2017-03-18 20:04:25

319

Views

Isomorphism with affine scheme

Published on 18 Mar 2017 - 20:04

score 333 · Answer 5 · 2017-03-19 00:40:11

333

Views

When is the induced map $f^{*}:\operatorname{Spec}(S) \to \operatorname{Spec}(R)$ a covering map?

Published on 19 Mar 2017 - 0:40

score 533 · Answer 6 · 2026-03-25 21:51:15

533

Views

Is the axiom of choice necessary to prove that closed points in the Zariski topology are maximal ideals?

Published on 25 Mar 2026 - 21:51

score 89 · Answer 7 · 2017-03-20 16:40:49

89

Views

A beginner's question on rational points

Published on 20 Mar 2017 - 16:40

score 177 · Answer 8 · 2017-03-23 14:41:34

177

Views

A simple question about projective modules and fraction fields

Published on 23 Mar 2017 - 14:41

score 909 · Answer 9 · 2017-03-26 12:27:53

909

Views

Finite union of affine schemes

Published on 26 Mar 2017 - 12:27

score 1.6k · Answer 10 · 2017-04-03 18:41:48

1.6k

Views

Understanding the geometry of the cross $\operatorname{Spec}(k[x,y]/(xy))$

Published on 03 Apr 2017 - 18:41

score 91 · Answer 11 · 2017-04-04 16:19:30

91

Views

$\mathcal{O}_{\mathsf{Proj} \: A}(\mathsf{Proj} \: A)=A$?

Published on 04 Apr 2017 - 16:19

score 380 · Answer 12 · 2017-04-06 15:40:47

380

Views

examples of étale algebras $ \mathbb{Q}[\sqrt[3]{2}] \times \mathbb{Q}[\sqrt[3]{5}]$

Published on 06 Apr 2017 - 15:40

score 301 · Answer 13 · 2017-04-07 21:39:02

301

Views

Why does the support of a module have finitely many minimal elements?

Published on 07 Apr 2017 - 21:39

score 85 · Answer 14 · 2023-02-08 10:33:22

85

Views

Intersection and preimage of standard affine open sets give another standard affine open set.

Published on 08 Feb 2023 - 10:33

score 64 · Answer 15 · 2023-02-16 21:15:16

64

Views

For $f : X \rightarrow Y$ a morphism of schemes, for $U \subset X$ a nonempty affine open, must $f(U)$ be contained in some affine open of $Y$?

Published on 16 Feb 2023 - 21:15

List Question

How can I work out the hopf-algebra action corresponding to a group action on an affine scheme?

examples of schemes other than $\text{spec} R$?

Manifold $M$ and affine scheme $\text{Spec}(C^\infty(M))$.

Isomorphism with affine scheme

When is the induced map $f^{*}:\operatorname{Spec}(S) \to \operatorname{Spec}(R)$ a covering map?

Is the axiom of choice necessary to prove that closed points in the Zariski topology are maximal ideals?

A beginner's question on rational points

A simple question about projective modules and fraction fields

Finite union of affine schemes

Understanding the geometry of the cross $\operatorname{Spec}(k[x,y]/(xy))$

$\mathcal{O}_{\mathsf{Proj} \: A}(\mathsf{Proj} \: A)=A$?

examples of étale algebras $ \mathbb{Q}[\sqrt[3]{2}] \times \mathbb{Q}[\sqrt[3]{5}]$

Why does the support of a module have finitely many minimal elements?

Intersection and preimage of standard affine open sets give another standard affine open set.

For $f : X \rightarrow Y$ a morphism of schemes, for $U \subset X$ a nonempty affine open, must $f(U)$ be contained in some affine open of $Y$?

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