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 102 · Answer 2 · 2026-05-11 06:34:35

102

Views

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

Published on 11 May 2026 - 6:34

score 104 · Answer 3 · 2026-04-15 04:05:19

104

Views

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

Published on 15 Apr 2026 - 4:05

score 50 · Answer 4 · 2026-04-16 10:58:56

50

Views

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

Published on 16 Apr 2026 - 10:58

score 43 · Answer 5 · 2026-04-15 02:43:45

43

Views

Corollary 5.3.4 in Szamuely, Galois group and fundamental groups

Published on 15 Apr 2026 - 2:43

score 41 · Answer 6 · 2026-03-26 12:57:59

41

Views

An etale cover of a semiperfect ring

Published on 26 Mar 2026 - 12:57

score 54 · Answer 7 · 2026-04-14 18:16:25

54

Views

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

Published on 14 Apr 2026 - 18:16

score 230 · Answer 8 · 2026-04-10 01:27:05

230

Views

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

Published on 10 Apr 2026 - 1:27

score 113 · Answer 9 · 2026-04-14 07:39:22

113

Views

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

Published on 14 Apr 2026 - 7:39

score 38 · Answer 10 · 2026-05-07 06:12:13

38

Views

Fix points of Galois action on etale homology

Published on 07 May 2026 - 6:12

score 51 · Answer 11 · 2026-04-09 12:03:53

51

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 09 Apr 2026 - 12:03

score 41 · Answer 12 · 2026-04-15 17:36:32

41

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 15 Apr 2026 - 17:36

score 78 · Answer 13 · 2026-04-17 12:00:54

78

Views

Pullback of Constant Sheaf: A "Very Plain Proof"

Published on 17 Apr 2026 - 12:00

score 64 · Answer 14 · 2026-04-14 21:06:05

64

Views

Using étale fundamental group to show unramifiedness of Tate module

Published on 14 Apr 2026 - 21:06

score 121 · Answer 15 · 2026-04-15 23:53:29

121

Views

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

Published on 15 Apr 2026 - 23:53

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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