Question

The $x$-coordinate map of $X:y^2+y=x^3\to\mathbb{P}^1$

score 49 · Answer 1 · 2023-02-25 23:06:22

49

Views

The $x$-coordinate map of $X:y^2+y=x^3\to\mathbb{P}^1$

Published on 25 Feb 2023 - 23:06

score 94 · Answer 2 · 2023-02-27 14:51:29

94

Views

An algebro-geometric instance of the inverse function theorem?

Published on 27 Feb 2023 - 14:51

score 220 · Answer 3 · 2023-02-28 05:47:52

220

Views

A question on Vakil's Rising Sea (Exercise 4.1.A, version 2022)

Published on 28 Feb 2023 - 5:47

score 253 · Answer 4 · 2023-03-02 01:43:48

253

Views

Question on Hartshorne exercise II 5.17(e)

Published on 02 Mar 2023 - 1:43

score 174 · Answer 5 · 2023-03-02 11:23:58

174

Views

quasicoherent sheaf of ideal defines a closed subscheme

Published on 02 Mar 2023 - 11:23

score 51 · Answer 6 · 2026-03-31 23:55:52

51

Views

detail in proof that existence of ample invertible sheaf implies separatedness

Published on 31 Mar 2026 - 23:55

score 136 · Answer 7 · 2026-03-25 12:29:31

136

Views

How do I interpret the intersection of a variety with a "non-closed hyperplane?"

Published on 25 Mar 2026 - 12:29

score 92 · Answer 8 · 2023-03-04 02:13:52

92

Views

scheme theoretic support of a finitely generated $A$-module

Published on 04 Mar 2023 - 2:13

score 63 · Answer 9 · 2023-03-04 10:41:13

63

Views

$V$ is locally closed subscheme (i.e. a closed subscheme of an open subscheme of $X$) do not implies that it's the open subscheme of closed subscheme

Published on 04 Mar 2023 - 10:41

score 158 · Answer 10 · 2023-03-05 18:27:24

158

Views

Diagonal of immersion is an isomorphism

Published on 05 Mar 2023 - 18:27

score 52 · Answer 11 · 2026-02-23 05:10:53

52

Views

Do restrictions preserve ring structure of ringed space?

Published on 23 Feb 2026 - 5:10

score 147 · Answer 12 · 2023-03-06 11:26:21

147

Views

Monomorphism of schemes which is not a an open or closed immersion

Published on 06 Mar 2023 - 11:26

score 94 · Answer 13 · 2026-03-25 12:24:00

94

Views

Sheaf morphism from closed subscheme is a closed immersion

Published on 25 Mar 2026 - 12:24

score 247 · Answer 14 · 2023-03-13 16:53:16

247

Views

Is there a notion of inverse image for schemes?

Published on 13 Mar 2023 - 16:53

score 108 · Answer 15 · 2023-03-16 15:35:03

108

Views

Is the change of base scheme $\operatorname{Spec} K \to \operatorname{Spec} k$ relevant?

Published on 16 Mar 2023 - 15:35

List Question

The $x$-coordinate map of $X:y^2+y=x^3\to\mathbb{P}^1$

An algebro-geometric instance of the inverse function theorem?

A question on Vakil's Rising Sea (Exercise 4.1.A, version 2022)

Question on Hartshorne exercise II 5.17(e)

quasicoherent sheaf of ideal defines a closed subscheme

detail in proof that existence of ample invertible sheaf implies separatedness

How do I interpret the intersection of a variety with a "non-closed hyperplane?"

scheme theoretic support of a finitely generated $A$-module

$V$ is locally closed subscheme (i.e. a closed subscheme of an open subscheme of $X$) do not implies that it's the open subscheme of closed subscheme

Diagonal of immersion is an isomorphism

Do restrictions preserve ring structure of ringed space?

Monomorphism of schemes which is not a an open or closed immersion

Sheaf morphism from closed subscheme is a closed immersion

Is there a notion of inverse image for schemes?

Is the change of base scheme $\operatorname{Spec} K \to \operatorname{Spec} k$ relevant?

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