Question

Does $P_2P_1 = P_2$ hold when $P_2$ and $P_1$ are orthogonal projections onto $M_2\subseteq M_1$

score 241 · Answer 1 · 2018-03-12 14:13:33

241

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Does $P_2P_1 = P_2$ hold when $P_2$ and $P_1$ are orthogonal projections onto $M_2\subseteq M_1$

Published on 12 Mar 2018 - 14:13

score 35 · Answer 2 · 2026-03-17 12:56:20

35

Views

Finding points in 3D plane that are closest possible

Published on 17 Mar 2026 - 12:56

score 767 · Answer 3 · 2026-03-22 23:41:57

767

Views

Generalized Projection of a Matrix onto the Non Negative Orthant

Published on 22 Mar 2026 - 23:41

score 166 · Answer 4 · 2026-03-22 11:05:58

166

Views

How to find the 3D point from projection point?

Published on 22 Mar 2026 - 11:05

score 140 · Answer 5 · 2026-03-17 22:24:02

140

Views

What kind of projection does a specific map (3D -> 2D) correspond to?

Published on 17 Mar 2026 - 22:24

score 28 · Answer 6 · 2026-03-21 16:14:03

28

Views

Projection of vectors.

Published on 21 Mar 2026 - 16:14

score 498 · Answer 7 · 2026-03-22 01:30:41

498

Views

Adjoint of the diagonal operator

Published on 22 Mar 2026 - 1:30

score 117 · Answer 8 · 2026-03-22 01:54:36

117

Views

Trigonometric formula derivation

Published on 22 Mar 2026 - 1:54

score 45.6k · Answer 9 · 2026-03-22 16:28:21

45.6k

Views

How to find Projection matrix onto the subspace

Published on 22 Mar 2026 - 16:28

score 1.5k · Answer 10 · 2026-03-22 05:33:44

1.5k

Views

Writing projection in terms of projection matrix

Published on 22 Mar 2026 - 5:33

score 493 · Answer 11 · 2018-04-06 17:59:57

493

Views

Is my proof valid? Let W1,W2 be subspaces finite-dim, IPS V with T1,T2 orthogonal projections on W1,W2. Show that T1T2=T0 iff W1 perp W2.

Published on 06 Apr 2018 - 17:59

score 390 · Answer 12 · 2018-04-06 20:05:30

390

Views

Let $T$ be a normal operator on a finite-dimensional complex inner product space. Show that if T is a projection, then it is an orthogonal projection.

Published on 06 Apr 2018 - 20:05

score 57 · Answer 13 · 2018-04-06 21:54:27

57

Views

I need help getting started with this one please (confusing Advanced Linear Algebra Problem)

Published on 06 Apr 2018 - 21:54

score 296 · Answer 14 · 2018-04-07 05:37:31

296

Views

What is the size of the face-centered orthogonal projection of a regular dodecahedron?

Published on 07 Apr 2018 - 5:37

score 102 · Answer 15 · 2026-03-22 05:10:48

102

Views

References to a Convex Analysis result.

Published on 22 Mar 2026 - 5:10

List Question

Does $P_2P_1 = P_2$ hold when $P_2$ and $P_1$ are orthogonal projections onto $M_2\subseteq M_1$

Finding points in 3D plane that are closest possible

Generalized Projection of a Matrix onto the Non Negative Orthant

How to find the 3D point from projection point?

What kind of projection does a specific map (3D -> 2D) correspond to?

Projection of vectors.

Adjoint of the diagonal operator

Trigonometric formula derivation

How to find Projection matrix onto the subspace

Writing projection in terms of projection matrix

Is my proof valid? Let W1,W2 be subspaces finite-dim, IPS V with T1,T2 orthogonal projections on W1,W2. Show that T1T2=T0 iff W1 perp W2.

Let $T$ be a normal operator on a finite-dimensional complex inner product space. Show that if T is a projection, then it is an orthogonal projection.

I need help getting started with this one please (confusing Advanced Linear Algebra Problem)

What is the size of the face-centered orthogonal projection of a regular dodecahedron?

References to a Convex Analysis result.

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