Question

Cohomology rings of $S^3\times\mathbb{C} P^{\infty}$ and $S^1 \times \mathbb{C} P^{\infty}/(S^1 \times \{x_0\})$

score 313 · Answer 1 · 2021-01-18 18:51:11

313

Views

Cohomology rings of $S^3\times\mathbb{C} P^{\infty}$ and $S^1 \times \mathbb{C} P^{\infty}/(S^1 \times \{x_0\})$

Published on 18 Jan 2021 - 18:51

score 57 · Answer 2 · 2021-01-19 12:51:08

57

Views

Boy's surface and normal vectors

Published on 19 Jan 2021 - 12:51

score 38 · Answer 3 · 2021-01-20 18:05:47

38

Views

Fixed point of maps between product of even dim projective spaces

Published on 20 Jan 2021 - 18:05

score 843 · Answer 4 · 2026-03-26 13:00:48

843

Views

Description of ideal of intersection of two projective varieties

Published on 26 Mar 2026 - 13:00

score 76 · Answer 5 · 2026-03-30 18:20:19

76

Views

Affine-space $A_{n}$ as group-action object vs as projective space subspace

Published on 30 Mar 2026 - 18:20

score 90 · Answer 6 · 2021-01-24 19:01:58

90

Views

Restriction of quotient map $\pi: \mathbb{C}^{n+1}\setminus \{0\} \to \mathbb{P}^n (\mathbb{C})$ to $S^{2n+1}$ is closed

Published on 24 Jan 2021 - 19:01

score 30 · Answer 7 · 2026-03-30 20:44:29

30

Views

Is a projective reference in Pn needed for an affine subspace to be set (by means of a group action)?

Published on 30 Mar 2026 - 20:44

score 76 · Answer 8 · 2021-01-25 01:39:04

76

Views

The fibers of the quotient map $q:\Bbb A^{n+1}\setminus\{0\}\to \Bbb P^{n}$ are irreducible.

Published on 25 Jan 2021 - 1:39

score 236 · Answer 9 · 2021-01-25 10:48:47

236

Views

When is the restriction of a quotient map $p : X \to Y$ to a retract of $X$ again a quotient map?

Published on 25 Jan 2021 - 10:48

score 215 · Answer 10 · 2026-03-26 07:34:46

215

Views

Fundamental points of Cremona plane transformation

Published on 26 Mar 2026 - 7:34

score 109 · Answer 11 · 2021-01-28 00:48:26

109

Views

Figure 7.7. and 7.8 in Loring Tu's An Introduction to manifolds

Published on 28 Jan 2021 - 0:48

score 39 · Answer 12 · 2021-02-02 21:26:10

39

Views

How to define $f$ so that $\mathbb{R}P^n \cong \mathbb{R}P^{n-1} ~ \cup_f D^n$

Published on 02 Feb 2021 - 21:26

score 113 · Answer 13 · 2026-03-28 09:57:03

113

Views

Cohomology of a smoothly embedded space curve

Published on 28 Mar 2026 - 9:57

score 150 · Answer 14 · 2026-03-25 08:08:40

150

Views

Weighted projective space as toric variety

Published on 25 Mar 2026 - 8:08

score 52 · Answer 15 · 2021-02-12 18:32:16

52

Views

Solutions to a linear equation over a subfield of a finite field

Published on 12 Feb 2021 - 18:32

List Question

Cohomology rings of $S^3\times\mathbb{C} P^{\infty}$ and $S^1 \times \mathbb{C} P^{\infty}/(S^1 \times \{x_0\})$

Boy's surface and normal vectors

Fixed point of maps between product of even dim projective spaces

Description of ideal of intersection of two projective varieties

Affine-space $A_{n}$ as group-action object vs as projective space subspace

Restriction of quotient map $\pi: \mathbb{C}^{n+1}\setminus \{0\} \to \mathbb{P}^n (\mathbb{C})$ to $S^{2n+1}$ is closed

Is a projective reference in Pn needed for an affine subspace to be set (by means of a group action)?

The fibers of the quotient map $q:\Bbb A^{n+1}\setminus\{0\}\to \Bbb P^{n}$ are irreducible.

When is the restriction of a quotient map $p : X \to Y$ to a retract of $X$ again a quotient map?

Fundamental points of Cremona plane transformation

Figure 7.7. and 7.8 in Loring Tu's An Introduction to manifolds

How to define $f$ so that $\mathbb{R}P^n \cong \mathbb{R}P^{n-1} ~ \cup_f D^n$

Cohomology of a smoothly embedded space curve

Weighted projective space as toric variety

Solutions to a linear equation over a subfield of a finite field

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