Question

What is the ramification group of a curve at a point

score 22 · Answer 1 · 2026-03-26 06:21:25

22

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What is the ramification group of a curve at a point

Published on 26 Mar 2026 - 6:21

score 101 · Answer 2 · 2026-03-25 12:48:46

101

Views

Is it possible to construct geometrically the ($\phi$, $\Gamma$)-module corresponding to a $p$-adic representation coming from geometry?

Published on 25 Mar 2026 - 12:48

score 102 · Answer 3 · 2026-03-26 08:00:50

102

Views

A localization sequence for étale cohomology of $\mathcal O_K$, where $K$ is a local field

Published on 26 Mar 2026 - 8:00

score 47 · Answer 4 · 2023-11-17 08:09:17

47

Views

Cohomology $H(X^{(p)}, \mathbb Q_{\ell})$ of the Frobenius twist of a variety over a finite field

Published on 17 Nov 2023 - 8:09

score 40 · Answer 5 · 2023-11-25 19:29:57

40

Views

Corollary 5.3.4 in Szamuely, Galois group and fundamental groups

Published on 25 Nov 2023 - 19:29

score 40 · Answer 6 · 2023-12-12 12:59:43

40

Views

An etale cover of a semiperfect ring

Published on 12 Dec 2023 - 12:59

score 53 · Answer 7 · 2026-03-26 07:33:55

53

Views

Correspondence, cycle class map and Bloch's decomposition of the diagonal

Published on 26 Mar 2026 - 7:33

score 227 · Answer 8 · 2024-02-08 06:29:48

227

Views

Does the boundary map $H^k(Z,\Lambda) \to H^{k+1}_c(U,\Lambda)$ factor through the closure of $U$?

Published on 08 Feb 2024 - 6:29

score 110 · Answer 9 · 2024-02-10 22:59:10

110

Views

étale $\ell$-adic cohomology is a Weil cohomology theory

Published on 10 Feb 2024 - 22:59

score 35 · Answer 10 · 2026-02-23 04:56:31

35

Views

Fix points of Galois action on etale homology

Published on 23 Feb 2026 - 4:56

score 50 · Answer 11 · 2026-02-23 06:40:53

50

Views

Why is the bilinear form on $H^d(X,\mathbb Q_{\ell})$ afforded by Poincaré duality alternating when $d = \dim(X)$ is odd?

Published on 23 Feb 2026 - 6:40

score 38 · Answer 12 · 2024-03-08 05:21:28

38

Views

Long exact sequence of $\ell$-adic cohomology with compact support for $X = X_1 \cup X_2$ union of two irreducible components

Published on 08 Mar 2024 - 5:21

score 73 · Answer 13 · 2024-03-19 01:49:27

73

Views

Pullback of Constant Sheaf: A "Very Plain Proof"

Published on 19 Mar 2024 - 1:49

score 61 · Answer 14 · 2024-03-25 03:08:23

61

Views

Using étale fundamental group to show unramifiedness of Tate module

Published on 25 Mar 2024 - 3:08

score 118 · Answer 15 · 2015-01-18 04:55:19

118

Views

Semisimplicity of Frobenius action on H^1(X,Q_p)

Published on 18 Jan 2015 - 4:55

List Question

What is the ramification group of a curve at a point

Is it possible to construct geometrically the ($\phi$, $\Gamma$)-module corresponding to a $p$-adic representation coming from geometry?

A localization sequence for étale cohomology of $\mathcal O_K$, where $K$ is a local field

Cohomology $H(X^{(p)}, \mathbb Q_{\ell})$ of the Frobenius twist of a variety over a finite field

Corollary 5.3.4 in Szamuely, Galois group and fundamental groups

An etale cover of a semiperfect ring

Correspondence, cycle class map and Bloch's decomposition of the diagonal

Does the boundary map $H^k(Z,\Lambda) \to H^{k+1}_c(U,\Lambda)$ factor through the closure of $U$?

étale $\ell$-adic cohomology is a Weil cohomology theory

Fix points of Galois action on etale homology

Why is the bilinear form on $H^d(X,\mathbb Q_{\ell})$ afforded by Poincaré duality alternating when $d = \dim(X)$ is odd?

Long exact sequence of $\ell$-adic cohomology with compact support for $X = X_1 \cup X_2$ union of two irreducible components

Pullback of Constant Sheaf: A "Very Plain Proof"

Using étale fundamental group to show unramifiedness of Tate module

Semisimplicity of Frobenius action on H^1(X,Q_p)

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