Question

Quotient of an affine scheme under the action of a finite group

score 229 · Answer 1 · 2021-02-19 15:00:17

229

Views

Quotient of an affine scheme under the action of a finite group

Published on 19 Feb 2021 - 15:00

score 257 · Answer 2 · 2021-02-20 23:47:28

257

Views

Every affine k-scheme can be embedded into an affine space?

Published on 20 Feb 2021 - 23:47

score 295 · Answer 3 · 2021-02-22 20:01:07

295

Views

When is the diagonal a closed immersion with open image?

Published on 22 Feb 2021 - 20:01

score 77 · Answer 4 · 2021-02-25 09:58:44

77

Views

Can there be non open affine subset in a scheme?

Published on 25 Feb 2021 - 9:58

score 280 · Answer 5 · 2021-02-25 15:20:01

280

Views

Faithfully flat map of schemes

Published on 25 Feb 2021 - 15:20

score 51 · Answer 6 · 2021-03-01 06:21:13

51

Views

Find the morphism of rings using morphism of schemes

Published on 01 Mar 2021 - 6:21

score 116 · Answer 7 · 2026-03-27 02:37:27

116

Views

Isomorphism of rings induced from schemes

Published on 27 Mar 2026 - 2:37

score 133 · Answer 8 · 2021-03-26 11:19:45

133

Views

Describe $\operatorname{Spec} R/fR$ with respect to prime decomposition of $f$ in a PID.

Published on 26 Mar 2021 - 11:19

score 73 · Answer 9 · 2021-03-28 13:28:33

73

Views

Trying to understand $\operatorname{Hom}(X,Y)=\operatorname{Hom}(A,\Gamma(Y,\mathcal{O}_Y)$ for $Y=\operatorname{Spec} A$ and $X$ a locally ringed.

Published on 28 Mar 2021 - 13:28

score 51 · Answer 10 · 2021-03-29 19:27:54

51

Views

Proof that a set is open using closed points on a $k$-scheme

Published on 29 Mar 2021 - 19:27

score 226 · Answer 11 · 2021-03-31 18:14:45

226

Views

Understanding Hartshorne's theorem II.3.1: a scheme is integral iff is both reduced and irreducible

Published on 31 Mar 2021 - 18:14

score 48 · Answer 12 · 2021-04-01 14:39:11

48

Views

Difference between Spec $k[x,y]/(y-x^2)$ and Spec $k[x,y]/((y-x^2)^2)$?

Published on 01 Apr 2021 - 14:39

score 218 · Answer 13 · 2021-04-02 13:18:22

218

Views

Form of basic open set of affine scheme: The intersection of two basic open sets.

Published on 02 Apr 2021 - 13:18

score 46 · Answer 14 · 2026-03-26 07:38:49

46

Views

Is the unit section of a finite flat commutative group scheme determined by sending group-like elements to 1?

Published on 26 Mar 2026 - 7:38

score 271 · Answer 15 · 2026-03-27 14:11:05

271

Views

Understanding Hartshorne's example II 3.2.2

Published on 27 Mar 2026 - 14:11

List Question

Quotient of an affine scheme under the action of a finite group

Every affine k-scheme can be embedded into an affine space?

When is the diagonal a closed immersion with open image?

Can there be non open affine subset in a scheme?

Faithfully flat map of schemes

Find the morphism of rings using morphism of schemes

Isomorphism of rings induced from schemes

Describe $\operatorname{Spec} R/fR$ with respect to prime decomposition of $f$ in a PID.

Trying to understand $\operatorname{Hom}(X,Y)=\operatorname{Hom}(A,\Gamma(Y,\mathcal{O}_Y)$ for $Y=\operatorname{Spec} A$ and $X$ a locally ringed.

Proof that a set is open using closed points on a $k$-scheme

Understanding Hartshorne's theorem II.3.1: a scheme is integral iff is both reduced and irreducible

Difference between Spec $k[x,y]/(y-x^2)$ and Spec $k[x,y]/((y-x^2)^2)$?

Form of basic open set of affine scheme: The intersection of two basic open sets.

Is the unit section of a finite flat commutative group scheme determined by sending group-like elements to 1?

Understanding Hartshorne's example II 3.2.2

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