Question

Close to a projection implies almost idempotent in C*-Algebra

score 89 · Answer 1 · 2023-11-08 10:26:55

89

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Close to a projection implies almost idempotent in C*-Algebra

Published on 08 Nov 2023 - 10:26

score 110 · Answer 2 · 2026-03-27 14:56:48

110

Views

Formula to project a 3D point onto a sphere, when centre of projection is not necessarily at the centre of the sphere

Published on 27 Mar 2026 - 14:56

score 70 · Answer 3 · 2023-11-17 18:41:22

70

Views

How to algebraically prove the sum of the projections of two sides of a triangle is equal to the projection of the third side of the triangle?

Published on 17 Nov 2023 - 18:41

score 105 · Answer 4 · 2023-11-20 07:39:01

105

Views

Panoramic projections of the hyperbolic plane

Published on 20 Nov 2023 - 7:39

score 20 · Answer 5 · 2023-11-20 14:58:42

20

Views

Union over preimages of projections form an algebra

Published on 20 Nov 2023 - 14:58

score 564 · Answer 6 · 2026-03-26 04:34:08

564

Views

Can one compute the location of the unseen point?

Published on 26 Mar 2026 - 4:34

score 48 · Answer 7 · 2026-03-26 01:28:33

48

Views

A doubt in solving a projection mapping and orthogonality question

Published on 26 Mar 2026 - 1:28

score 34 · Answer 8 · 2026-03-25 08:08:35

34

Views

Projecting a $v$ onto $v+\epsilon$.

Published on 25 Mar 2026 - 8:08

score 224 · Answer 9 · 2023-11-23 16:51:28

224

Views

An example of an non-invertible operator F such that a truncated operator F will be invertible

Published on 23 Nov 2023 - 16:51

score 157 · Answer 10 · 2023-11-24 19:30:59

157

Views

Why can the area projected onto a plane be calculated with the dot product of the vector area and the unit vector of the plane?

Published on 24 Nov 2023 - 19:30

score 20 · Answer 11 · 2023-11-25 10:21:41

20

Views

Orthogonal Projection onto the Set of Square Matrices with a Unit Trace

Published on 25 Nov 2023 - 10:21

score 94 · Answer 12 · 2023-11-26 10:57:59

94

Views

If $P$ is an idempotent and $\langle Px,x\rangle \geq 0$, show that $P$ is a projection

Published on 26 Nov 2023 - 10:57

score 267 · Answer 13 · 2026-03-25 06:08:18

267

Views

Finding the missing centre or vertex of a projected rectangle.

Published on 25 Mar 2026 - 6:08

score 90 · Answer 14 · 2026-03-25 22:26:42

90

Views

How can I get the appropriate coordinates to display 3D-hyperbolic space in the Beltrami Klein model?

Published on 25 Mar 2026 - 22:26

score 11 · Answer 15 · 2026-03-26 06:08:11

11

Views

Existence of projection $P$ equivalent to $P' \circ T \circ P''$ for projections $P', P''$ and smooth translation $T$?

Published on 26 Mar 2026 - 6:08

List Question

Close to a projection implies almost idempotent in C*-Algebra

Formula to project a 3D point onto a sphere, when centre of projection is not necessarily at the centre of the sphere

How to algebraically prove the sum of the projections of two sides of a triangle is equal to the projection of the third side of the triangle?

Panoramic projections of the hyperbolic plane

Union over preimages of projections form an algebra

Can one compute the location of the unseen point?

A doubt in solving a projection mapping and orthogonality question

Projecting a $v$ onto $v+\epsilon$.

An example of an non-invertible operator F such that a truncated operator F will be invertible

Why can the area projected onto a plane be calculated with the dot product of the vector area and the unit vector of the plane?

Orthogonal Projection onto the Set of Square Matrices with a Unit Trace

If $P$ is an idempotent and $\langle Px,x\rangle \geq 0$, show that $P$ is a projection

Finding the missing centre or vertex of a projected rectangle.

How can I get the appropriate coordinates to display 3D-hyperbolic space in the Beltrami Klein model?

Existence of projection $P$ equivalent to $P' \circ T \circ P''$ for projections $P', P''$ and smooth translation $T$?

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