Question

Visualizing the "pinched plane"

score 289 · Answer 1 · 2026-03-26 17:51:50

289

Views

Visualizing the "pinched plane"

Published on 26 Mar 2026 - 17:51

score 80 · Answer 2 · 2016-12-11 16:06:02

80

Views

Describing a particular scheme

Published on 11 Dec 2016 - 16:06

score 266 · Answer 3 · 2016-12-15 16:48:40

266

Views

Let $X$ be a scheme satisfying $(*)$, then is any integral closed subscheme $Y$ determined by its topological space?

Published on 15 Dec 2016 - 16:48

score 109 · Answer 4 · 2016-12-16 07:03:02

109

Views

Show morphism of varieties has image which is finite set of closed points.

Published on 16 Dec 2016 - 7:03

score 355 · Answer 5 · 2026-03-25 10:52:48

355

Views

Proj and fiber product

Published on 25 Mar 2026 - 10:52

score 1.6k · Answer 6 · 2026-03-26 12:58:01

1.6k

Views

Closed immersion being an affine-local property on the target.

Published on 26 Mar 2026 - 12:58

score 948 · Answer 7 · 2026-03-30 22:56:09

948

Views

Is the projection from the fiber product flat?

Published on 30 Mar 2026 - 22:56

score 355 · Answer 8 · 2026-03-25 12:13:55

355

Views

Understanding projective scheme as representable functor

Published on 25 Mar 2026 - 12:13

score 127 · Answer 9 · 2026-03-30 13:37:20

127

Views

What affine line are we considering when defining a geometric vector bundle over a scheme $X$?

Published on 30 Mar 2026 - 13:37

score 4.6k · Answer 10 · 2017-01-04 03:43:51

4.6k

Views

Show a scheme is integral if and only if it is irreducible and reduced.

Published on 04 Jan 2017 - 3:43

score 25 · Answer 11 · 2026-03-25 20:19:10

25

Views

Is an affine open subset of a scheme stable under specialisations?

Published on 25 Mar 2026 - 20:19

score 263 · Answer 12 · 2026-03-26 07:58:18

263

Views

Is a proper morphism of schemes open?

Published on 26 Mar 2026 - 7:58

score 110 · Answer 13 · 2017-01-05 20:06:20

110

Views

Geometric realisation of the forgetful and other functors

Published on 05 Jan 2017 - 20:06

score 420 · Answer 14 · 2017-01-06 15:23:05

420

Views

Showing that morphisms of $k$-schemes that agree topologically are equal.

Published on 06 Jan 2017 - 15:23

score 300 · Answer 15 · 2017-01-07 01:57:48

300

Views

Finite morphisms of degree $\leq 1$ at all points are injective (Vakil Exercise $19.1.C.$)

Published on 07 Jan 2017 - 1:57

List Question

Visualizing the "pinched plane"

Describing a particular scheme

Let $X$ be a scheme satisfying $(*)$, then is any integral closed subscheme $Y$ determined by its topological space?

Show morphism of varieties has image which is finite set of closed points.

Proj and fiber product

Closed immersion being an affine-local property on the target.

Is the projection from the fiber product flat?

Understanding projective scheme as representable functor

What affine line are we considering when defining a geometric vector bundle over a scheme $X$?

Show a scheme is integral if and only if it is irreducible and reduced.

Is an affine open subset of a scheme stable under specialisations?

Is a proper morphism of schemes open?

Geometric realisation of the forgetful and other functors

Showing that morphisms of $k$-schemes that agree topologically are equal.

Finite morphisms of degree $\leq 1$ at all points are injective (Vakil Exercise $19.1.C.$)

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