Question

Why degree of freedom of orthographic projection is 5?

score 894 · Answer 1 · 2026-03-30 02:40:55

894

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Why degree of freedom of orthographic projection is 5?

Published on 30 Mar 2026 - 2:40

score 214 · Answer 2 · 2017-12-06 20:23:25

214

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Implicit formula of the projective completion of an affine plane

Published on 06 Dec 2017 - 20:23

score 134 · Answer 3 · 2017-12-08 06:26:57

134

Views

Classical projective transformation

Published on 08 Dec 2017 - 6:26

score 65 · Answer 4 · 2017-12-08 12:31:25

65

Views

Polarity of lines in $\mathbb{RP}^3$

Published on 08 Dec 2017 - 12:31

score 95 · Answer 5 · 2017-12-09 16:40:28

95

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Two triangles are inscribed in conic iff their edges are tangent to another conic.

Published on 09 Dec 2017 - 16:40

score 3.7k · Answer 6 · 2017-12-12 18:00:59

3.7k

Views

Vertical inclination from pitch and roll

Published on 12 Dec 2017 - 18:00

score 149 · Answer 7 · 2017-12-13 00:58:52

149

Views

Find 2 orthonormal vectors that parametrically describe a plane from a normal and a point?

Published on 13 Dec 2017 - 0:58

score 135 · Answer 8 · 2017-12-13 16:27:37

135

Views

Vertices of two triangles, self-polar with respect to one conic, lie on another conic (My proof added)

Published on 13 Dec 2017 - 16:27

score 420 · Answer 9 · 2026-03-26 07:46:53

420

Views

Is $\Bbb P^1_k$ simply the blow up of $\operatorname{Spec}k$?

Published on 26 Mar 2026 - 7:46

score 295 · Answer 10 · 2026-03-26 09:18:04

295

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If third tangent of Parabola at $R$ meets other two tangents at $P'$ and $Q'$ find $\frac{TP'}{TP}+\frac{TQ'}{TQ}$

Published on 26 Mar 2026 - 9:18

score 110 · Answer 11 · 2017-12-15 17:40:20

110

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Prove that $\frac{AQ* RB}{QR}$ is constant, while point $P$ moves along the ray $AB$.

Published on 15 Dec 2017 - 17:40

score 1.6k · Answer 12 · 2017-12-18 03:33:54

1.6k

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How to show eigenvalues of any rotation matrix of $3 \times 3$ are $\{ 1, e^{i\theta}, e^{-i\theta}\}$

Published on 18 Dec 2017 - 3:33

score 359 · Answer 13 · 2017-12-18 23:36:14

359

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Relationship between Euclidean lines and projective points

Published on 18 Dec 2017 - 23:36

score 228 · Answer 14 · 2017-12-19 12:47:25

228

Views

IMO shortlist problem

Published on 19 Dec 2017 - 12:47

score 234 · Answer 15 · 2026-02-23 08:28:27

234

Views

What is the analogue of the cross ratio in higher dimensions and what role does it play in n-dimensional geometry?

Published on 23 Feb 2026 - 8:28

List Question

Why degree of freedom of orthographic projection is 5?

Implicit formula of the projective completion of an affine plane

Classical projective transformation

Polarity of lines in $\mathbb{RP}^3$

Two triangles are inscribed in conic iff their edges are tangent to another conic.

Vertical inclination from pitch and roll

Find 2 orthonormal vectors that parametrically describe a plane from a normal and a point?

Vertices of two triangles, self-polar with respect to one conic, lie on another conic (My proof added)

Is $\Bbb P^1_k$ simply the blow up of $\operatorname{Spec}k$?

If third tangent of Parabola at $R$ meets other two tangents at $P'$ and $Q'$ find $\frac{TP'}{TP}+\frac{TQ'}{TQ}$

Prove that $\frac{AQ* RB}{QR}$ is constant, while point $P$ moves along the ray $AB$.

How to show eigenvalues of any rotation matrix of $3 \times 3$ are $\{ 1, e^{i\theta}, e^{-i\theta}\}$

Relationship between Euclidean lines and projective points

IMO shortlist problem

What is the analogue of the cross ratio in higher dimensions and what role does it play in n-dimensional geometry?

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