List questions from projective-geometry

Published on 26 Mar 2026 - 13:30

65

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action of $GL_3$ on $P^2$

Published on 26 Mar 2026 - 17:52

453

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How do you work with the space of circles on the sphere considered as the projective line?

Published on 06 Dec 2014 - 22:52

842

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How does the Möbius group act on circlines?

Published on 07 Dec 2014 - 5:56

1k

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Central Projection - Project point $X$ on plane $\pi$

Published on 08 Dec 2014 - 13:17

218

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Is the cone over Grassmannian manifold $Gr_2(\mathbb{C}^n)$ an open set of a determinantal variety?

Published on 25 Mar 2026 - 12:21

314

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What do we lose in Projective Spaces?

Published on 11 Dec 2014 - 10:38

60

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A point $\in \mathbb{P}^2(\mathbb{C})$

Published on 12 Dec 2014 - 0:06

743

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Intersection fo Projective Lines

Published on 12 Dec 2014 - 14:35

945

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Why is the projection of a vector V onto a span W, independent of the orthogonal basis of W.

Published on 26 Mar 2026 - 16:10

464

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Is a line just an infinitely large circle?

Published on 15 Dec 2014 - 0:34

32

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Cross of two n-dimensional planes.

Published on 16 Dec 2014 - 6:23

299

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In projective geometry the dual of the cross ratio dual is an angle measurement?

Published on 19 Dec 2014 - 18:20

125

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On the embedding in Hartshorne I 6.8

Published on 03 Oct 2019 - 8:09

90

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Why use the affine plane $\mathbb A^2$ (rather than $\mathbb R^2$) in writing $\mathbb{RP}^2=\mathbb A^2\sqcup\mathbb{RP}^1$?

Published on 26 Mar 2026 - 15:17

List Question

Questions about intersection of linear varieties in a projective space

action of $GL_3$ on $P^2$

How do you work with the space of circles on the sphere considered as the projective line?

How does the Möbius group act on circlines?

Central Projection - Project point $X$ on plane $\pi$

Is the cone over Grassmannian manifold $Gr_2(\mathbb{C}^n)$ an open set of a determinantal variety?

What do we lose in Projective Spaces?

A point $\in \mathbb{P}^2(\mathbb{C})$

Intersection fo Projective Lines

Why is the projection of a vector V onto a span W, independent of the orthogonal basis of W.

Is a line just an infinitely large circle?

Cross of two n-dimensional planes.

In projective geometry the dual of the cross ratio dual is an angle measurement?

On the embedding in Hartshorne I 6.8

Why use the affine plane $\mathbb A^2$ (rather than $\mathbb R^2$) in writing $\mathbb{RP}^2=\mathbb A^2\sqcup\mathbb{RP}^1$?

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