Question

A question on the subscheme of a $k$-scheme of finite type

score 247 · Answer 1 · 2026-04-12 05:18:44

247

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A question on the subscheme of a $k$-scheme of finite type

Published on 12 Apr 2026 - 5:18

score 186 · Answer 2 · 2026-04-06 23:59:14

186

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Two points in projective space: $(\mathbf{P}^2)^{[2]} \simeq \text{Bl}_\Delta (\mathbf{P}^2 \times \mathbf{P}^2)/S_2$

Published on 06 Apr 2026 - 23:59

score 138 · Answer 3 · 2021-05-07 18:53:05

138

Views

Manifolds and Schemes from Idempotent Splitting

Published on 07 May 2021 - 18:53

score 121 · Answer 4 · 2026-04-11 11:14:54

121

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What is the difference between invertible sheaf and sheaf of ring on a ringed space?

Published on 11 Apr 2026 - 11:14

score 460 · Answer 5 · 2026-04-12 21:44:28

460

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Why do we need Noetherianness to conclude that a connected scheme is integral iff its local rings are?

Published on 12 Apr 2026 - 21:44

score 276 · Answer 6 · 2026-04-11 05:36:10

276

Views

Subsheaves and stalks

Published on 11 Apr 2026 - 5:36

score 77 · Answer 7 · 2021-05-11 05:49:27

77

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Is an algebraic set, all of whose irreducible components are projective varieties, projective too?

Published on 11 May 2021 - 5:49

score 53 · Answer 8 · 2026-04-08 10:01:49

53

Views

If P = "Of finite type", then a morphism of schemes $f: X \to Y$ is locally of finite type iff $f$ is locally of type P.

Published on 08 Apr 2026 - 10:01

score 52 · Answer 9 · 2021-05-11 21:38:52

52

Views

Basic Question about Hartshorne's definition of "locally of finite type".

Published on 11 May 2021 - 21:38

score 95 · Answer 10 · 2026-03-28 16:58:13

95

Views

Projection as limit of flat family (Hartshorne III.9.8.3)

Published on 28 Mar 2026 - 16:58

score 62 · Answer 11 · 2026-04-10 01:31:27

62

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$\Gamma$-equivalence definition of zero-cycles

Published on 10 Apr 2026 - 1:31

score 124 · Answer 12 · 2026-04-12 04:07:27

124

Views

Confusion about Affine Plane with Origin Removed

Published on 12 Apr 2026 - 4:07

score 361 · Answer 13 · 2026-04-12 18:48:00

361

Views

Injection into double dual is isomorphism away from codimension $\geq 2$ subscheme

Published on 12 Apr 2026 - 18:48

score 125 · Answer 14 · 2026-03-25 13:54:43

125

Views

Finite type scheme over a ring of $S$-integers is separated?

Published on 25 Mar 2026 - 13:54

score 278 · Answer 15 · 2026-04-09 07:50:07

278

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$\DeclareMathOperator{\Spec}{Spec}$Doubt about Nike's Lemma about the intersection of $\Spec A$ and $\Spec B$

Published on 09 Apr 2026 - 7:50

List Question

A question on the subscheme of a $k$-scheme of finite type

Two points in projective space: $(\mathbf{P}^2)^{[2]} \simeq \text{Bl}_\Delta (\mathbf{P}^2 \times \mathbf{P}^2)/S_2$

Manifolds and Schemes from Idempotent Splitting

What is the difference between invertible sheaf and sheaf of ring on a ringed space?

Why do we need Noetherianness to conclude that a connected scheme is integral iff its local rings are?

Subsheaves and stalks

Is an algebraic set, all of whose irreducible components are projective varieties, projective too?

If P = "Of finite type", then a morphism of schemes $f: X \to Y$ is locally of finite type iff $f$ is locally of type P.

Basic Question about Hartshorne's definition of "locally of finite type".

Projection as limit of flat family (Hartshorne III.9.8.3)

$\Gamma$-equivalence definition of zero-cycles

Confusion about Affine Plane with Origin Removed

Injection into double dual is isomorphism away from codimension $\geq 2$ subscheme

Finite type scheme over a ring of $S$-integers is separated?

$\DeclareMathOperator{\Spec}{Spec}$Doubt about Nike's Lemma about the intersection of $\Spec A$ and $\Spec B$

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