Question

Can you give two closed immersions $(f,f^\sharp),(g,g^\sharp):(X,\mathcal O_X)\to (Y,\mathcal O_Y)$ such that $f=g$ but $f^\sharp\neq g^\sharp$?

score 67 · Answer 1 · 2026-03-25 20:12:45

Can you give two closed immersions $(f,f^\sharp),(g,g^\sharp):(X,\mathcal O_X)\to (Y,\mathcal O_Y)$ such that $f=g$ but $f^\sharp\neq g^\sharp$?

score 332 · Answer 2 · 2026-03-25 12:52:25

332

Views

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score 103 · Answer 3 · 2026-03-25 23:22:58

103

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score 58 · Answer 4 · 2026-04-01 06:30:21

58

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score 124 · Answer 5 · 2026-04-01 06:27:20

124

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score 234 · Answer 6 · 2018-07-30 23:13:40

234

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score 98 · Answer 7 · 2026-03-29 06:33:47

98

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What is the action of $\mathrm{Gal}(\overline{\mathbb{Q}}/\mathbb{Q})$ on the Teichmuller tower?

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score 174 · Answer 8 · 2026-03-25 06:09:59

174

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score 237 · Answer 9 · 2026-03-27 01:45:02

237

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score 208 · Answer 10 · 2026-03-25 06:13:10

208

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Does there exist an ideal sheaf $\mathcal F$ on some affine scheme $X$ such that $\mathcal F$ is not quasi-coherent?

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score 130 · Answer 11 · 2026-04-04 05:25:46

130

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score 109 · Answer 12 · 2026-03-25 01:37:47

109

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score 720 · Answer 13 · 2026-04-01 12:40:50

720

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score 68 · Answer 14 · 2026-03-26 13:01:52

68

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score 657 · Answer 15 · 2026-03-25 01:37:05

657

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List Question

Can you give two closed immersions $(f,f^\sharp),(g,g^\sharp):(X,\mathcal O_X)\to (Y,\mathcal O_Y)$ such that $f=g$ but $f^\sharp\neq g^\sharp$?

Solution to Putnam 2007 A-1

Translations of an irreducible plane curve

Failure of Artin Approximation for non excellent schemes

Question about a Variety as a Representable Functor

Configuration of infinitely near points

What is the action of $\mathrm{Gal}(\overline{\mathbb{Q}}/\mathbb{Q})$ on the Teichmuller tower?

Finite maps and jacobian condition

Why is the kernel of the Verschiebung morphism either étale either connected?

Does there exist an ideal sheaf $\mathcal F$ on some affine scheme $X$ such that $\mathcal F$ is not quasi-coherent?

A group scheme whose reduced underlying scheme is not normal

Grassmannian as a functor and the rank of a projective module.

Hartshorne Exercise II. 1.18

algebra-geometric correpondence for real or complex manifolds

Projective Resolution of $C[x,y,t]/(x^2+y^2-t)$

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