Question

Maximal spectrum as affine scheme

score 212 · Answer 1 · 2026-04-10 19:27:33

212

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Maximal spectrum as affine scheme

Published on 10 Apr 2026 - 19:27

score 327 · Answer 2 · 2026-04-13 17:13:53

327

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Exercise 4.3.13 on Frobenius morphisms in Qing Liu's Algebraic Geometry

Published on 13 Apr 2026 - 17:13

score 136 · Answer 3 · 2026-03-25 15:45:35

136

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When is a stack a sheaf?

Published on 25 Mar 2026 - 15:45

score 116 · Answer 4 · 2026-04-11 00:47:12

116

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Motivation of formally étale morphisms of schemes

Published on 11 Apr 2026 - 0:47

score 31 · Answer 5 · 2022-08-29 21:22:31

31

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On a smooth relative curve $X/S$, is there always a local parameter $z$ such that $\mathrm{d}z$ generates $\Omega_{X/S}^1$?

Published on 29 Aug 2022 - 21:22

score 105 · Answer 6 · 2026-04-09 17:26:54

105

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Why is this condition sufficient for a topological space to be irreducible?

Published on 09 Apr 2026 - 17:26

score 336 · Answer 7 · 2022-09-06 15:21:35

336

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Question on Hartshorne exercise II.2.17: A criterion for affineness

Published on 06 Sep 2022 - 15:21

score 57 · Answer 8 · 2026-03-26 11:18:06

57

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For divisor $D$, how to describe isomorphisms $H^0(X,\mathcal{O}_D(nD)) \xrightarrow{\sim} H^0(X,\mathcal{O}_D\left((n+1)D\right)$?

Published on 26 Mar 2026 - 11:18

score 194 · Answer 9 · 2026-04-14 06:02:54

194

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$\operatorname{Hilb}^8(\mathbb{P}^4_k)$ not irreducible (Ex. in Hartshorne's Deformation Theory book)

Published on 14 Apr 2026 - 6:02

score 209 · Answer 10 · 2026-03-26 07:58:49

209

Views

On representability of $\underline{Hom}_k(\mathbb A^1_k, \mathbb A^1_k)$

Published on 26 Mar 2026 - 7:58

score 97 · Answer 11 · 2026-04-11 02:46:56

97

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Is $\mathbb{P}^1$ a group scheme?

Published on 11 Apr 2026 - 2:46

score 151 · Answer 12 · 2026-04-14 02:55:51

151

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Dependence of strict transform on the subscheme along which we blow up

Published on 14 Apr 2026 - 2:55

score 167 · Answer 13 · 2026-04-13 18:29:28

167

Views

Closure of image of morphism of affine schemes

Published on 13 Apr 2026 - 18:29

score 145 · Answer 14 · 2026-03-25 20:22:58

145

Views

Can I recover the Zariski open subobjects from the Grothendieck topology they generate?

Published on 25 Mar 2026 - 20:22

score 236 · Answer 15 · 2026-04-09 22:12:27

236

Views

Is restriction of smooth functions to an open submanifold epimorphic?

Published on 09 Apr 2026 - 22:12

List Question

Maximal spectrum as affine scheme

Exercise 4.3.13 on Frobenius morphisms in Qing Liu's Algebraic Geometry

When is a stack a sheaf?

Motivation of formally étale morphisms of schemes

On a smooth relative curve $X/S$, is there always a local parameter $z$ such that $\mathrm{d}z$ generates $\Omega_{X/S}^1$?

Why is this condition sufficient for a topological space to be irreducible?

Question on Hartshorne exercise II.2.17: A criterion for affineness

For divisor $D$, how to describe isomorphisms $H^0(X,\mathcal{O}_D(nD)) \xrightarrow{\sim} H^0(X,\mathcal{O}_D\left((n+1)D\right)$?

$\operatorname{Hilb}^8(\mathbb{P}^4_k)$ not irreducible (Ex. in Hartshorne's Deformation Theory book)

On representability of $\underline{Hom}_k(\mathbb A^1_k, \mathbb A^1_k)$

Is $\mathbb{P}^1$ a group scheme?

Dependence of strict transform on the subscheme along which we blow up

Closure of image of morphism of affine schemes

Can I recover the Zariski open subobjects from the Grothendieck topology they generate?

Is restriction of smooth functions to an open submanifold epimorphic?

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