Question

Is this functor from $\sf R-alg$ to this particular set of formal power series an affine scheme?

score 69 · Answer 1 · 2017-08-21 04:39:37

69

Views

Is this functor from $\sf R-alg$ to this particular set of formal power series an affine scheme?

Published on 21 Aug 2017 - 4:39

score 44 · Answer 2 · 2017-08-22 09:45:15

44

Views

Fake proof for affineness for any morphism of schemes

Published on 22 Aug 2017 - 9:45

score 83 · Answer 3 · 2017-08-26 00:41:52

83

Views

Model of affine space whose saturation is projective space

Published on 26 Aug 2017 - 0:41

score 542 · Answer 4 · 2017-08-27 03:26:23

542

Views

Help doing an exercise on a criterion for affiness from Hartshorne

Published on 27 Aug 2017 - 3:26

score 97 · Answer 5 · 2017-08-27 23:39:47

97

Views

Examples of morphisms which are injective on complex points but not an isomorphism.

Published on 27 Aug 2017 - 23:39

score 58 · Answer 6 · 2017-08-27 23:51:24

58

Views

Is the following an affine scheme?

Published on 27 Aug 2017 - 23:51

score 714 · Answer 7 · 2017-08-30 11:15:56

714

Views

How should we think about the sections of a sheaf on a scheme as functions?

Published on 30 Aug 2017 - 11:15

score 49 · Answer 8 · 2017-09-05 18:00:44

49

Views

Equivariant automorphisms and GIT quotients

Published on 05 Sep 2017 - 18:00

score 450 · Answer 9 · 2026-02-23 10:51:23

450

Views

Is there a notion of "schemeification" analogous to that of sheafification of a presheaf?

Published on 23 Feb 2026 - 10:51

score 144 · Answer 10 · 2017-09-25 05:37:53

144

Views

Intersections/unions of open/closed schemes

Published on 25 Sep 2017 - 5:37

score 301 · Answer 11 · 2017-09-28 15:24:49

301

Views

Easy question about higher direct image functors with affine base

Published on 28 Sep 2017 - 15:24

score 148 · Answer 12 · 2026-03-26 06:05:18

148

Views

Algebra representing the group scheme $\mathbb Z/ n\mathbb Z$

Published on 26 Mar 2026 - 6:05

score 1.1k · Answer 13 · 2017-09-30 13:12:38

1.1k

Views

An affine scheme is connected $\Leftrightarrow$ $\mathcal O(X)\ne \{0\}\land $ only have trivial nilpotents

Published on 30 Sep 2017 - 13:12

score 555 · Answer 14 · 2017-10-03 10:30:07

555

Views

Show that if $X$ is an integral affine scheme, then every open subscheme is dense

Published on 03 Oct 2017 - 10:30

score 859 · Answer 15 · 2017-10-03 23:28:20

859

Views

Galois action and Weil restriction

Published on 03 Oct 2017 - 23:28

List Question

Is this functor from $\sf R-alg$ to this particular set of formal power series an affine scheme?

Fake proof for affineness for any morphism of schemes

Model of affine space whose saturation is projective space

Help doing an exercise on a criterion for affiness from Hartshorne

Examples of morphisms which are injective on complex points but not an isomorphism.

Is the following an affine scheme?

How should we think about the sections of a sheaf on a scheme as functions?

Equivariant automorphisms and GIT quotients

Is there a notion of "schemeification" analogous to that of sheafification of a presheaf?

Intersections/unions of open/closed schemes

Easy question about higher direct image functors with affine base

Algebra representing the group scheme $\mathbb Z/ n\mathbb Z$

An affine scheme is connected $\Leftrightarrow$ $\mathcal O(X)\ne \{0\}\land $ only have trivial nilpotents

Show that if $X$ is an integral affine scheme, then every open subscheme is dense

Galois action and Weil restriction

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