Question

Projectivization and stereographic projection, or: Why nonlinear + nonlinear = linear?

score 495 · Answer 1 · 2026-03-27 13:50:47

495

Views

Projectivization and stereographic projection, or: Why nonlinear + nonlinear = linear?

Published on 27 Mar 2026 - 13:50

score 182 · Answer 2 · 2015-12-03 09:22:00

182

Views

How to compute an orthogonal projection of a vector that is not in the vector space?

Published on 03 Dec 2015 - 9:22

score 525 · Answer 3 · 2026-03-29 15:14:32

525

Views

Basic conceptual questions about orthogonality in Linear Algebra,

Published on 29 Mar 2026 - 15:14

score 959 · Answer 4 · 2015-12-15 14:20:16

959

Views

Tangent Space to Grassmannian

Published on 15 Dec 2015 - 14:20

score 274 · Answer 5 · 2015-12-15 20:37:11

274

Views

Diffeomorphism between $\mathbb{P}^n$ and the submanifold of $\mathbb{R}^{(n+1)^2}$ consisting of certain matrices?

Published on 15 Dec 2015 - 20:37

score 179 · Answer 6 · 2015-12-15 21:25:41

179

Views

How do I see that $\mathbb{RP}^4$ and $\mathbb{RP}^6$ do not admit fields of tangent $2$-planes?

Published on 15 Dec 2015 - 21:25

score 57 · Answer 7 · 2015-12-16 04:10:54

57

Views

"General position" in a poset

Published on 16 Dec 2015 - 4:10

score 539 · Answer 8 · 2026-03-27 17:34:06

539

Views

Two twisted cubic curves in $\mathbb P^3$ intersect iff they lie in a common cubic surface

Published on 27 Mar 2026 - 17:34

score 1k · Answer 9 · 2026-03-25 12:51:04

1k

Views

Projecting a sphere from inside

Published on 25 Mar 2026 - 12:51

score 124 · Answer 10 · 2016-01-01 14:28:45

124

Views

Projection of an oblique circle on XZ plane

Published on 01 Jan 2016 - 14:28

score 6.9k · Answer 11 · 2016-01-01 19:47:01

6.9k

Views

Why are orthogonal projection matrices not ... orthogonal?

Published on 01 Jan 2016 - 19:47

score 427 · Answer 12 · 2026-03-28 14:54:18

427

Views

Is this method of finding a "dual curve" correct?

Published on 28 Mar 2026 - 14:54

score 1k · Answer 13 · 2026-03-29 23:45:29

1k

Views

Can 3 transformations (V, Σ, U) of SVD to describe a perspective transformation?

Published on 29 Mar 2026 - 23:45

score 1.1k · Answer 14 · 2016-01-04 12:31:52

1.1k

Views

Hypersurfaces meet everything of dimension at least 1 in projective space

Published on 04 Jan 2016 - 12:31

score 61 · Answer 15 · 2016-01-06 18:56:43

61

Views

$V\subset \mathbb{P}^n(k)$ is irreducible, prove that $\dim(V)$ is the transcendence degree of $k(V)$ over $k$.

Published on 06 Jan 2016 - 18:56

List Question

Projectivization and stereographic projection, or: Why nonlinear + nonlinear = linear?

How to compute an orthogonal projection of a vector that is not in the vector space?

Basic conceptual questions about orthogonality in Linear Algebra,

Tangent Space to Grassmannian

Diffeomorphism between $\mathbb{P}^n$ and the submanifold of $\mathbb{R}^{(n+1)^2}$ consisting of certain matrices?

How do I see that $\mathbb{RP}^4$ and $\mathbb{RP}^6$ do not admit fields of tangent $2$-planes?

"General position" in a poset

Two twisted cubic curves in $\mathbb P^3$ intersect iff they lie in a common cubic surface

Projecting a sphere from inside

Projection of an oblique circle on XZ plane

Why are orthogonal projection matrices not ... orthogonal?

Is this method of finding a "dual curve" correct?

Can 3 transformations (V, Σ, U) of SVD to describe a perspective transformation?

Hypersurfaces meet everything of dimension at least 1 in projective space

$V\subset \mathbb{P}^n(k)$ is irreducible, prove that $\dim(V)$ is the transcendence degree of $k(V)$ over $k$.

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