Question

How to write the real projective plane as a pushout of a disk and the mobius strip?

score 706 · Answer 1 · 2016-05-05 12:30:58

706

Views

How to write the real projective plane as a pushout of a disk and the mobius strip?

Published on 05 May 2016 - 12:30

score 710 · Answer 2 · 2016-05-05 14:18:13

710

Views

Understanding problem 2.6 in Hartshornes algebraic geometry book .

Published on 05 May 2016 - 14:18

score 96 · Answer 3 · 2026-02-23 10:50:37

96

Views

What properties single out $ \operatorname{Spec}(\mathbb{k}) $-schemes that are quasi-projective varieties over $ \mathbb{k} $?

Published on 23 Feb 2026 - 10:50

score 276 · Answer 4 · 2016-05-12 14:33:39

276

Views

An example calculated in Principles of Algebraic Geometry of Griffiths and Harris'.

Published on 12 May 2016 - 14:33

score 300 · Answer 5 · 2016-05-12 15:46:36

300

Views

Intersection of 3 or 4 dimensional subspaces of $\mathbb{P}^5$

Published on 12 May 2016 - 15:46

score 1.2k · Answer 6 · 2016-05-13 00:20:51

1.2k

Views

What would an infinite dimensional projective space look like as a scheme?

Published on 13 May 2016 - 0:20

score 251 · Answer 7 · 2016-05-14 11:40:33

251

Views

If two projective lines both intersect four given projective lines, must the two lines be parallel on an affine open?

Published on 14 May 2016 - 11:40

score 179 · Answer 8 · 2026-03-26 02:55:01

179

Views

The subgroup of $PGL(V)$ stabilizing a projective configuration

Published on 26 Mar 2026 - 2:55

score 92 · Answer 9 · 2016-05-18 19:12:56

92

Views

Is $\mathbb{R}P^1 \times \mathbb{R}P^1 = \mathbb{R}P^2$? If it isn't what does it look like?

Published on 18 May 2016 - 19:12

score 61 · Answer 10 · 2016-05-18 21:24:53

61

Views

Degree of maps $\mu \colon \mathbb{P}^1\rightarrow \mathbb{P}^r$

Published on 18 May 2016 - 21:24

score 3.3k · Answer 11 · 2016-05-19 22:56:21

3.3k

Views

Euler characteristic of the projective plane (using embedding diagram)

Published on 19 May 2016 - 22:56

score 58 · Answer 12 · 2016-05-24 22:08:49

58

Views

Associating to every line a vector in that line in an algebraic way

Published on 24 May 2016 - 22:08

score 340 · Answer 13 · 2026-03-25 19:04:09

340

Views

Homotopy 'diagrams' for Klein bottle and projective plane

Published on 25 Mar 2026 - 19:04

score 97 · Answer 14 · 2016-05-24 23:39:53

97

Views

Geometric Significance that 2D Points Form a Line

Published on 24 May 2016 - 23:39

score 165 · Answer 15 · 2016-05-25 10:40:35

165

Views

cubic surface equation

Published on 25 May 2016 - 10:40

List Question

How to write the real projective plane as a pushout of a disk and the mobius strip?

Understanding problem 2.6 in Hartshornes algebraic geometry book .

What properties single out $ \operatorname{Spec}(\mathbb{k}) $-schemes that are quasi-projective varieties over $ \mathbb{k} $?

An example calculated in Principles of Algebraic Geometry of Griffiths and Harris'.

Intersection of 3 or 4 dimensional subspaces of $\mathbb{P}^5$

What would an infinite dimensional projective space look like as a scheme?

If two projective lines both intersect four given projective lines, must the two lines be parallel on an affine open?

The subgroup of $PGL(V)$ stabilizing a projective configuration

Is $\mathbb{R}P^1 \times \mathbb{R}P^1 = \mathbb{R}P^2$? If it isn't what does it look like?

Degree of maps $\mu \colon \mathbb{P}^1\rightarrow \mathbb{P}^r$

Euler characteristic of the projective plane (using embedding diagram)

Associating to every line a vector in that line in an algebraic way

Homotopy 'diagrams' for Klein bottle and projective plane

Geometric Significance that 2D Points Form a Line

cubic surface equation

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