List questions from projective-space

Published on 21 May 2014 - 2:12

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What does it mean to call horizontal lines through O the "points at infinity" in real projective plane $RP^2$?

Published on 03 Jun 2014 - 5:31

172

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How does a linear fractional function behave like a $2\times 2$ matrix?

Published on 04 Jun 2014 - 3:33

5.7k

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What exactly does a Möbius transformation do?

Published on 04 Jun 2014 - 20:21

54

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Is this subset of $PSL(n,\mathbb{R})$ Zariski-closed?

Published on 05 Jun 2014 - 19:48

69

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Determining the exact form of a projection in a Hilbert space

Published on 08 Jun 2014 - 0:06

588

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Matrix for orthogonal projection

Published on 14 Jun 2014 - 8:56

512

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How to define a "distance" from point to line in 3D projective space which is projectively invariant?

Published on 22 Mar 2026 - 8:38

949

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Resolution of Singularities: Base Point

Published on 25 Mar 2026 - 7:40

636

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The degree of a map between complex projective lines

Published on 21 Jun 2014 - 12:19

1.5k

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Blow-ups in Projective Space

Published on 25 Mar 2026 - 9:31

100

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Enumerative projective geometry

Published on 22 Jun 2014 - 14:56

2.5k

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The cross-ratio of four points is a real number exactly when the four points lie on a line or a circle

Published on 05 Jul 2014 - 12:40

77

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How to show that $f_* (\sigma)=\sigma$ where $f$ is mapping between projective spaces $\mathbb{R}\text{P}^3$

Published on 08 Jul 2014 - 13:11

154

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Vector space and its Projectivized Space

Published on 09 Jul 2014 - 6:08

List Question

Isometries and geodesics in projective plane using covering

What does it mean to call horizontal lines through O the "points at infinity" in real projective plane $RP^2$?

How does a linear fractional function behave like a $2\times 2$ matrix?

What exactly does a Möbius transformation do?

Is this subset of $PSL(n,\mathbb{R})$ Zariski-closed?

Determining the exact form of a projection in a Hilbert space

Matrix for orthogonal projection

How to define a "distance" from point to line in 3D projective space which is projectively invariant?

Resolution of Singularities: Base Point

The degree of a map between complex projective lines

Blow-ups in Projective Space

Enumerative projective geometry

The cross-ratio of four points is a real number exactly when the four points lie on a line or a circle

How to show that $f_* (\sigma)=\sigma$ where $f$ is mapping between projective spaces $\mathbb{R}\text{P}^3$

Vector space and its Projectivized Space

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