Question

"Every geometry is a projective geometry." So is hyperbolic geometry a projective geometry?

score 2.7k · Answer 1 · 2026-04-01 10:43:17

2.7k

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"Every geometry is a projective geometry." So is hyperbolic geometry a projective geometry?

Published on 01 Apr 2026 - 10:43

score 62 · Answer 2 · 2015-10-29 18:06:29

62

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Relation between curves in a complete linear system contained in another

Published on 29 Oct 2015 - 18:06

score 77 · Answer 3 · 2015-10-30 14:59:01

77

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Independence of curves in hypersurface of toric variety

Published on 30 Oct 2015 - 14:59

score 71 · Answer 4 · 2026-03-10 23:00:27

71

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Why only one $\infty $ point for each parallel class of lines in $\mathbb{R}^2$?

Published on 10 Mar 2026 - 23:00

score 771 · Answer 5 · 2026-03-31 03:34:40

771

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Condition for ramification points of a projection $\pi : X \to \mathbb{P}^1 $

Published on 31 Mar 2026 - 3:34

score 155 · Answer 6 · 2015-11-04 19:47:09

155

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Why is the quadrilateral cyclic

Published on 04 Nov 2015 - 19:47

score 81 · Answer 7 · 2015-11-05 11:00:24

81

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Tricks to find $\dim H^0(O(D)(n))$

Published on 05 Nov 2015 - 11:00

score 296 · Answer 8 · 2015-11-06 10:42:06

296

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Degree of $f:\mathbb{P}^1_k\rightarrow \mathbb{P}^1_k$

Published on 06 Nov 2015 - 10:42

score 285 · Answer 9 · 2026-03-30 21:00:42

285

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Projective Geometry True/False Questions

Published on 30 Mar 2026 - 21:00

score 817 · Answer 10 · 2015-11-08 17:18:03

817

Views

How to find a harmonic conjugate based on a complete quadrangle determined by a triangle and a point inside it?

Published on 08 Nov 2015 - 17:18

score 55 · Answer 11 · 2026-03-28 12:14:37

55

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How to draw the dual of a quadrangle determined by four points?

Published on 28 Mar 2026 - 12:14

score 48 · Answer 12 · 2015-11-09 01:58:17

48

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What is the projection of the vector $v = [-3, 2, 3]^T$ on the plane with equation $1x + 1y - 2z = 0$?

Published on 09 Nov 2015 - 1:58

score 263 · Answer 13 · 2015-11-10 00:28:29

263

Views

Convex hull in projective space

Published on 10 Nov 2015 - 0:28

score 1.2k · Answer 14 · 2015-11-12 17:34:19

1.2k

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Is it possible to project orthogonally an ellipse with major and minor axes $2a$,$2b$ so that its image is a circle with diameter $2b$?

Published on 12 Nov 2015 - 17:34

score 182 · Answer 15 · 2015-11-13 15:35:48

182

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$Tor^*_{\mathcal O_{\mathbb P^3}}(\mathcal O_{L_1}, \mathcal O_{L_2})$ for two lines $L_i$ in the projective space

Published on 13 Nov 2015 - 15:35

List Question

"Every geometry is a projective geometry." So is hyperbolic geometry a projective geometry?

Relation between curves in a complete linear system contained in another

Independence of curves in hypersurface of toric variety

Why only one $\infty $ point for each parallel class of lines in $\mathbb{R}^2$?

Condition for ramification points of a projection $\pi : X \to \mathbb{P}^1 $

Why is the quadrilateral cyclic

Tricks to find $\dim H^0(O(D)(n))$

Degree of $f:\mathbb{P}^1_k\rightarrow \mathbb{P}^1_k$

Projective Geometry True/False Questions

How to find a harmonic conjugate based on a complete quadrangle determined by a triangle and a point inside it?

How to draw the dual of a quadrangle determined by four points?

What is the projection of the vector $v = [-3, 2, 3]^T$ on the plane with equation $1x + 1y - 2z = 0$?

Convex hull in projective space

Is it possible to project orthogonally an ellipse with major and minor axes $2a$,$2b$ so that its image is a circle with diameter $2b$?

$Tor^*_{\mathcal O_{\mathbb P^3}}(\mathcal O_{L_1}, \mathcal O_{L_2})$ for two lines $L_i$ in the projective space

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