Question

Computing étale cohomology group $H^1( \text{Spec}(k), \mu_n)$ and $H^1( \text{Spec}(k), \underline{\Bbb{Z}/\mathord{n \Bbb{Z}}})$

score 890 · Answer 1 · 2026-03-17 08:02:37

890

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Computing étale cohomology group $H^1( \text{Spec}(k), \mu_n)$ and $H^1( \text{Spec}(k), \underline{\Bbb{Z}/\mathord{n \Bbb{Z}}})$

Published on 17 Mar 2026 - 8:02

score 350 · Answer 2 · 2026-03-22 02:14:41

350

Views

Descent datum for a module

Published on 22 Mar 2026 - 2:14

score 914 · Answer 3 · 2026-03-17 13:54:44

914

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About the definition of l-adic Tate-twist

Published on 17 Mar 2026 - 13:54

score 609 · Answer 4 · 2018-09-22 02:44:06

609

Views

Comparison of the mod p etale cohomology of special fiber and generic fiber

Published on 22 Sep 2018 - 2:44

score 419 · Answer 5 · 2026-03-22 09:37:28

419

Views

Strict Epimorphism of Schemes

Published on 22 Mar 2026 - 9:37

score 59 · Answer 6 · 2026-03-25 06:21:05

59

Views

The dimension of stalks for flat morphisms

Published on 25 Mar 2026 - 6:21

score 408 · Answer 7 · 2026-03-22 13:38:11

408

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Explaination of "Smooth of relative dimension d".

Published on 22 Mar 2026 - 13:38

score 218 · Answer 8 · 2018-11-03 14:55:03

218

Views

Does a sheaf of abelian groups on a scheme $X$ induce a sheaf of abelian groups on the étale site $X_{ét}$?

Published on 03 Nov 2018 - 14:55

score 592 · Answer 9 · 2026-03-25 03:16:40

592

Views

Why étale?

Published on 25 Mar 2026 - 3:16

score 221 · Answer 10 · 2019-01-01 21:23:58

221

Views

The small étale topos of a scheme is equivalent to the category of finite $\pi_1(X,x)$-sets for every scheme $X$ and every geometric point $x$

Published on 01 Jan 2019 - 21:23

score 159 · Answer 11 · 2026-03-25 06:04:18

159

Views

Cech cohomology does not compute étale cohomology - Explanation of an example

Published on 25 Mar 2026 - 6:04

score 96 · Answer 12 · 2019-01-10 03:40:42

96

Views

Is the quotient presheaf $\mathbb{G}_m/\mu_p$ an étale sheaf?

Published on 10 Jan 2019 - 3:40

score 298 · Answer 13 · 2026-03-22 13:36:46

298

Views

Proposition 1.6.6, Etale Cohomology theory, Lei Fu

Published on 22 Mar 2026 - 13:36

score 149 · Answer 14 · 2026-03-22 14:46:34

149

Views

Calculating etale cohomology of Picard stack

Published on 22 Mar 2026 - 14:46

score 494 · Answer 15 · 2019-02-21 01:14:04

494

Views

Proper morphism induces a map between compact support etale cohomology groups

Published on 21 Feb 2019 - 1:14

List Question

Computing étale cohomology group $H^1( \text{Spec}(k), \mu_n)$ and $H^1( \text{Spec}(k), \underline{\Bbb{Z}/\mathord{n \Bbb{Z}}})$

Descent datum for a module

About the definition of l-adic Tate-twist

Comparison of the mod p etale cohomology of special fiber and generic fiber

Strict Epimorphism of Schemes

The dimension of stalks for flat morphisms

Explaination of "Smooth of relative dimension d".

Does a sheaf of abelian groups on a scheme $X$ induce a sheaf of abelian groups on the étale site $X_{ét}$?

Why étale?

The small étale topos of a scheme is equivalent to the category of finite $\pi_1(X,x)$-sets for every scheme $X$ and every geometric point $x$

Cech cohomology does not compute étale cohomology - Explanation of an example

Is the quotient presheaf $\mathbb{G}_m/\mu_p$ an étale sheaf?

Proposition 1.6.6, Etale Cohomology theory, Lei Fu

Calculating etale cohomology of Picard stack

Proper morphism induces a map between compact support etale cohomology groups

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