Question

$P$ is projection matrix iff $A$ is reflection matrix?

score 1.2k · Answer 1 · 2016-12-29 10:42:00

1.2k

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$P$ is projection matrix iff $A$ is reflection matrix?

Published on 29 Dec 2016 - 10:42

score 4.4k · Answer 2 · 2026-03-26 14:20:46

4.4k

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Projection of a point onto a convex polyhedra

Published on 26 Mar 2026 - 14:20

score 24 · Answer 3 · 2023-01-29 20:00:08

24

Views

A result about the separation of a point and a convex closed set

Published on 29 Jan 2023 - 20:00

score 48 · Answer 4 · 2026-03-26 07:43:33

48

Views

Exercise 1, Section 6.7 of Hoffman’s Linear Algebra

Published on 26 Mar 2026 - 7:43

score 39 · Answer 5 · 2023-02-01 15:21:55

39

Views

Difficulties to understand projections (about PCA)

Published on 01 Feb 2023 - 15:21

score 528 · Answer 6 · 2026-03-27 11:47:00

528

Views

Projection of a 3D circle onto a 2D camera image

Published on 27 Mar 2026 - 11:47

score 70 · Answer 7 · 2026-03-25 23:39:31

70

Views

Prove that $P_{h}(f)$ satisfies $||f-P_{h}|| \leq Ch^{2}$

Published on 25 Mar 2026 - 23:39

score 99 · Answer 8 · 2023-02-05 10:39:19

99

Views

Why is $\mathrm{Ran}(P) = \mathrm{Ker}(I - P)$ for a projection mapping $P$?

Published on 05 Feb 2023 - 10:39

score 23 · Answer 9 · 2023-02-05 11:19:43

23

Views

If $P$ is a projection mapping, $\mathcal{R}(P)$ is closed and $(v_k, P(v_k))\to(v, w)\in X^2$ then why $Pw = w$?

Published on 05 Feb 2023 - 11:19

score 42 · Answer 10 · 2023-02-05 14:52:33

42

Views

Showing that if $P\in\mathcal{B}(\mathcal{H}):||P||\leq 1$ and $P$ is a projection mapping, then $P$ is necessarily an orthogonal projection

Published on 05 Feb 2023 - 14:52

score 55 · Answer 11 · 2023-02-17 18:52:50

55

Views

Distance of a function (as a vector) from a certain kernel

Published on 17 Feb 2023 - 18:52

score 24 · Answer 12 · 2026-02-23 06:37:55

24

Views

Why does it suffice to define the homogeneous projection operator by only testing with continuous instead of measurable functions?

Published on 23 Feb 2026 - 6:37

score 450 · Answer 13 · 2023-02-25 23:51:55

450

Views

Finding the projection of a vector onto another vector

Published on 25 Feb 2023 - 23:51

score 32 · Answer 14 · 2023-03-01 01:26:52

32

Views

Rewriting a linear transformation from formula to matrix

Published on 01 Mar 2023 - 1:26

score 133 · Answer 15 · 2023-03-02 11:13:49

133

Views

How can the conditional expectation be the $L^2$ projection, when the $L^2$ projection depends on the choice of the norm?

Published on 02 Mar 2023 - 11:13

List Question

$P$ is projection matrix iff $A$ is reflection matrix?

Projection of a point onto a convex polyhedra

A result about the separation of a point and a convex closed set

Exercise 1, Section 6.7 of Hoffman’s Linear Algebra

Difficulties to understand projections (about PCA)

Projection of a 3D circle onto a 2D camera image

Prove that $P_{h}(f)$ satisfies $||f-P_{h}|| \leq Ch^{2}$

Why is $\mathrm{Ran}(P) = \mathrm{Ker}(I - P)$ for a projection mapping $P$?

If $P$ is a projection mapping, $\mathcal{R}(P)$ is closed and $(v_k, P(v_k))\to(v, w)\in X^2$ then why $Pw = w$?

Showing that if $P\in\mathcal{B}(\mathcal{H}):||P||\leq 1$ and $P$ is a projection mapping, then $P$ is necessarily an orthogonal projection

Distance of a function (as a vector) from a certain kernel

Why does it suffice to define the homogeneous projection operator by only testing with continuous instead of measurable functions?

Finding the projection of a vector onto another vector

Rewriting a linear transformation from formula to matrix

How can the conditional expectation be the $L^2$ projection, when the $L^2$ projection depends on the choice of the norm?

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