Question

Embedding space of rational maps into projective space

score 30 · Answer 1 · 2023-12-05 21:43:55

30

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Embedding space of rational maps into projective space

Published on 05 Dec 2023 - 21:43

score 89 · Answer 2 · 2026-03-25 19:05:29

89

Views

Definition and computation of concrete blow-up on projective plane

Published on 25 Mar 2026 - 19:05

score 88 · Answer 3 · 2026-03-27 00:05:53

88

Views

Does homotopy type of a map $S^1 \to RP^1$ defines a homotopy type of $(D^2, S^1)\to (RP^2, RP^1)$?

Published on 27 Mar 2026 - 0:05

score 86 · Answer 4 · 2026-03-25 05:05:40

86

Views

Is the weighted projective space $\mathbb{P}(1,2,2)$ smooth?

Published on 25 Mar 2026 - 5:05

score 63 · Answer 5 · 2023-12-09 17:44:34

63

Views

Finding $r$ hyperplanes intersecting a dimension-$r$ closed subset of $\mathbb{P}^n_k$ at finitely many points: requirement that $k$ is infinite?

Published on 09 Dec 2023 - 17:44

score 110 · Answer 6 · 2023-12-11 00:46:12

110

Views

Projective transformation on homogeneous polynomials

Published on 11 Dec 2023 - 0:46

score 64 · Answer 7 · 2026-03-26 04:30:37

64

Views

There exist a hyperplane $H$ such that $\nu_d (\mathbb{P}^n) \cap H = \nu_d(\mathbb{V}(g))$

Published on 26 Mar 2026 - 4:30

score 97 · Answer 8 · 2026-03-26 12:37:48

97

Views

Show product of projective spaces minus a hypersurface is affine

Published on 26 Mar 2026 - 12:37

score 68 · Answer 9 · 2026-03-26 17:34:37

68

Views

If $Y$ is a projective variety and $Y \cap \mathbb{V}(g) = \emptyset$, then $Y$ is affine

Published on 26 Mar 2026 - 17:34

score 113 · Answer 10 · 2026-03-26 04:34:41

113

Views

$ (\mathbb{P}^n \times \mathbb{P}^n) \setminus \Gamma$ is isomorphic to an affine variety

Published on 26 Mar 2026 - 4:34

score 161 · Answer 11 · 2026-03-27 00:04:59

161

Views

Computation of $H^∗ (Σ\mathbb RP^n , \mathbb F_2)$ as graded $\mathbb F_2$-algebras

Published on 27 Mar 2026 - 0:04

score 74 · Answer 12 · 2023-12-17 16:20:25

74

Views

On suspension of real projective spaces

Published on 17 Dec 2023 - 16:20

score 114 · Answer 13 · 2023-12-18 10:50:20

114

Views

Exercise II.7.3 Hartshorne

Published on 18 Dec 2023 - 10:50

score 78 · Answer 14 · 2023-12-27 03:44:54

78

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How to compute the cohomology ring of complex projective space with coefficient $\mathbb{Z}$?

Published on 27 Dec 2023 - 3:44

score 49 · Answer 15 · 2023-12-28 16:06:31

49

Views

Question about the fixed point set of projective involution on $\mathbb{RP}^2$

Published on 28 Dec 2023 - 16:06

List Question

Embedding space of rational maps into projective space

Definition and computation of concrete blow-up on projective plane

Does homotopy type of a map $S^1 \to RP^1$ defines a homotopy type of $(D^2, S^1)\to (RP^2, RP^1)$?

Is the weighted projective space $\mathbb{P}(1,2,2)$ smooth?

Finding $r$ hyperplanes intersecting a dimension-$r$ closed subset of $\mathbb{P}^n_k$ at finitely many points: requirement that $k$ is infinite?

Projective transformation on homogeneous polynomials

There exist a hyperplane $H$ such that $\nu_d (\mathbb{P}^n) \cap H = \nu_d(\mathbb{V}(g))$

Show product of projective spaces minus a hypersurface is affine

If $Y$ is a projective variety and $Y \cap \mathbb{V}(g) = \emptyset$, then $Y$ is affine

$ (\mathbb{P}^n \times \mathbb{P}^n) \setminus \Gamma$ is isomorphic to an affine variety

Computation of $H^∗ (Σ\mathbb RP^n , \mathbb F_2)$ as graded $\mathbb F_2$-algebras

On suspension of real projective spaces

Exercise II.7.3 Hartshorne

How to compute the cohomology ring of complex projective space with coefficient $\mathbb{Z}$?

Question about the fixed point set of projective involution on $\mathbb{RP}^2$

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