Question

Long exact sequence of sheaf cohomology from the normal bundle of $\mathbb{P}^1$ in $\mathbb{P}^2$

score 270 · Answer 1 · 2026-03-26 04:53:10

270

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Long exact sequence of sheaf cohomology from the normal bundle of $\mathbb{P}^1$ in $\mathbb{P}^2$

Published on 26 Mar 2026 - 4:53

score 91 · Answer 2 · 2020-04-19 15:59:52

91

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Short exact sequences envolving syzygies

Published on 19 Apr 2020 - 15:59

score 41 · Answer 3 · 2020-04-20 01:50:53

41

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If $0\stackrel{f}\rightarrow V \stackrel{g}\rightarrow 0$ is an exact sequence, then $V = 0$.

Published on 20 Apr 2020 - 1:50

score 285 · Answer 4 · 2026-03-27 00:58:11

285

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Double cover and cohomology

Published on 27 Mar 2026 - 0:58

score 855 · Answer 5 · 2020-04-21 21:41:06

855

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External power of locally free sheaves

Published on 21 Apr 2020 - 21:41

score 178 · Answer 6 · 2026-03-26 09:45:08

178

Views

Visualizing split extensions and central extensions

Published on 26 Mar 2026 - 9:45

score 568 · Answer 7 · 2020-04-24 16:44:59

568

Views

Double Complex Where $\mathrm{Tot}^\prod$ is Acyclic but $\mathrm{Tot}^\oplus$ is not

Published on 24 Apr 2020 - 16:44

score 44 · Answer 8 · 2020-04-25 17:24:05

44

Views

Cosets of $\Bbb Z/p$ in $\Bbb Z/p^2$: do $g, 2g, 3g, \ldots, pg$ lie in separate cosets where $\langle g \rangle = \Bbb Z/p^2$?

Published on 25 Apr 2020 - 17:24

score 155 · Answer 9 · 2020-04-27 20:53:01

155

Views

Exactness in category theory

Published on 27 Apr 2020 - 20:53

score 191 · Answer 10 · 2020-04-28 18:22:29

191

Views

How can I show that this diagram is commutative using Mayer-Vietoris sequences?

Published on 28 Apr 2020 - 18:22

score 581 · Answer 11 · 2026-03-25 17:53:05

581

Views

Has anyone seen this generalization of the snake lemma? Is it useful?

Published on 25 Mar 2026 - 17:53

score 177 · Answer 12 · 2020-05-01 12:17:48

177

Views

Explicit description of all extensions of $\mathbf{Z}/n\mathbf{Z}$ by $\mathbf{Z}$

Published on 01 May 2020 - 12:17

score 1.1k · Answer 13 · 2020-05-01 17:55:08

1.1k

Views

Short exact sequence and pushout

Published on 01 May 2020 - 17:55

score 174 · Answer 14 · 2020-05-01 17:59:33

174

Views

Additivity of Rank of an Abelian group

Published on 01 May 2020 - 17:59

score 66 · Answer 15 · 2026-03-25 23:16:39

66

Views

Determining the homomorphism $\varphi: H \to \mathrm{Aut}(K)$ given a section $s: H \to G$

Published on 25 Mar 2026 - 23:16

List Question

Long exact sequence of sheaf cohomology from the normal bundle of $\mathbb{P}^1$ in $\mathbb{P}^2$

Short exact sequences envolving syzygies

If $0\stackrel{f}\rightarrow V \stackrel{g}\rightarrow 0$ is an exact sequence, then $V = 0$.

Double cover and cohomology

External power of locally free sheaves

Visualizing split extensions and central extensions

Double Complex Where $\mathrm{Tot}^\prod$ is Acyclic but $\mathrm{Tot}^\oplus$ is not

Cosets of $\Bbb Z/p$ in $\Bbb Z/p^2$: do $g, 2g, 3g, \ldots, pg$ lie in separate cosets where $\langle g \rangle = \Bbb Z/p^2$?

Exactness in category theory

How can I show that this diagram is commutative using Mayer-Vietoris sequences?

Has anyone seen this generalization of the snake lemma? Is it useful?

Explicit description of all extensions of $\mathbf{Z}/n\mathbf{Z}$ by $\mathbf{Z}$

Short exact sequence and pushout

Additivity of Rank of an Abelian group

Determining the homomorphism $\varphi: H \to \mathrm{Aut}(K)$ given a section $s: H \to G$

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