Question

How do I compute the action of an automorphism on the Néron-Severi group of a projective variety?

score 53 · Answer 1 · 2024-02-04 07:38:12

53

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How do I compute the action of an automorphism on the Néron-Severi group of a projective variety?

Published on 04 Feb 2024 - 7:38

score 121 · Answer 2 · 2024-02-05 01:27:16

121

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Is there a non-coherent subsheaf of $\mathscr{O}(-1)$ on $\mathbb{P}^1$

Published on 05 Feb 2024 - 1:27

score 60 · Answer 3 · 2024-02-12 18:02:44

Showing injectivity of a map between the sum of Picard groups of projective smooth irrudicible curve and the Picard group of the product of the curve

score 92 · Answer 4 · 2024-02-15 12:59:38

92

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Type of the intersection form of a degree $d$ hypersurface of $\mathbb{P}^3$.

Published on 15 Feb 2024 - 12:59

score 41 · Answer 5 · 2024-02-27 21:35:47

41

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What are the conditions for a function $f\colon X \to Y$ to be regular when $X$ and $Y$ are prevarieties?

Published on 27 Feb 2024 - 21:35

score 41 · Answer 6 · 2026-03-25 11:01:00

41

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Finding a good homogeneous coordinate ring for a smooth projective variety

Published on 25 Mar 2026 - 11:01

score 52 · Answer 7 · 2024-03-21 00:59:51

52

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Regularity of $H \cap X$ in Bertini's Theorem (Hartshorne CH. 2, Theorem 8.18)

Published on 21 Mar 2024 - 0:59

score 1.9k · Answer 8 · 2026-03-25 15:51:31

1.9k

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Affine Cover of $\mathbb{P}^n$

Published on 25 Mar 2026 - 15:51

score 167 · Answer 9 · 2020-08-11 21:33:50

167

Views

How to show the blowing down a ruled surface is projective

Published on 11 Aug 2020 - 21:33

score 238 · Answer 10 · 2020-08-14 05:10:03

238

Views

Given a projective variety, finding another variety of appropriate dimension with empty intersection

Published on 14 Aug 2020 - 5:10

score 485 · Answer 11 · 2020-08-15 23:25:40

485

Views

universal property of Albanese variety

Published on 15 Aug 2020 - 23:25

score 458 · Answer 12 · 2020-08-23 12:15:52

458

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Bertini's Theorem Proof Explanation from Vakil's notes

Published on 23 Aug 2020 - 12:15

score 235 · Answer 13 · 2020-09-02 11:26:10

235

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Conic bundles structure

Published on 02 Sep 2020 - 11:26

score 425 · Answer 14 · 2020-09-07 12:47:14

425

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Some Examples of Sheaves on Varieties (Hartshorne's Exercise II.1.21)

Published on 07 Sep 2020 - 12:47

score 174 · Answer 15 · 2020-09-18 19:37:27

174

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Degree of union is the sum of degrees

Published on 18 Sep 2020 - 19:37

List Question

How do I compute the action of an automorphism on the Néron-Severi group of a projective variety?

Is there a non-coherent subsheaf of $\mathscr{O}(-1)$ on $\mathbb{P}^1$

Showing injectivity of a map between the sum of Picard groups of projective smooth irrudicible curve and the Picard group of the product of the curve

Type of the intersection form of a degree $d$ hypersurface of $\mathbb{P}^3$.

What are the conditions for a function $f\colon X \to Y$ to be regular when $X$ and $Y$ are prevarieties?

Finding a good homogeneous coordinate ring for a smooth projective variety

Regularity of $H \cap X$ in Bertini's Theorem (Hartshorne CH. 2, Theorem 8.18)

Affine Cover of $\mathbb{P}^n$

How to show the blowing down a ruled surface is projective

Given a projective variety, finding another variety of appropriate dimension with empty intersection

universal property of Albanese variety

Bertini's Theorem Proof Explanation from Vakil's notes

Conic bundles structure

Some Examples of Sheaves on Varieties (Hartshorne's Exercise II.1.21)

Degree of union is the sum of degrees

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