Question

Is $ (1+ |x|^2)\operatorname{Id} - x \otimes x $ positive definite?

score 42 · Answer 1 · 2026-04-15 00:50:36

42

Views

Is $ (1+ |x|^2)\operatorname{Id} - x \otimes x $ positive definite?

Published on 15 Apr 2026 - 0:50

score 480 · Answer 2 · 2026-04-15 13:26:39

480

Views

If I subtract 1 from the n,n entry of a Pascal Matrix, why does the determinant become zero?

Published on 15 Apr 2026 - 13:26

score 202 · Answer 3 · 2026-04-12 22:09:30

202

Views

Does representation irreducibility ensure non-zero determinant?

Published on 12 Apr 2026 - 22:09

score 2.5k · Answer 4 · 2026-04-15 20:39:37

2.5k

Views

Rank of an NxN matrix

Published on 15 Apr 2026 - 20:39

score 213 · Answer 5 · 2026-04-16 00:05:28

213

Views

Matrix power rank problem

Published on 16 Apr 2026 - 0:05

score 330 · Answer 6 · 2026-04-16 16:32:46

330

Views

Struggling with finding matrices such as AC = AD when C is not equal D and A has no elements equal to zero.

Published on 16 Apr 2026 - 16:32

score 151 · Answer 7 · 2026-04-29 12:52:57

151

Views

How to build invertible Toeplitz matrices?

Published on 29 Apr 2026 - 12:52

score 249 · Answer 8 · 2026-04-14 21:47:45

249

Views

Prove that a 2N × 2N Hamiltonian matrix A satisfies JAJ = transpose(A)

Published on 14 Apr 2026 - 21:47

score 270 · Answer 9 · 2026-04-15 11:02:52

270

Views

If $V \in \mathbb{R}^{n \times n}$ is an orthogonal matrix, and $V^T e=0$, ($e$ is the ones vector) then is it true $V_m^T e = 0\, \forall \, m<n$?

Published on 15 Apr 2026 - 11:02

score 44 · Answer 10 · 2026-04-13 14:03:16

44

Views

$p$-roots of the identity on SO($n$)

Published on 13 Apr 2026 - 14:03

score 470 · Answer 11 · 2026-04-12 19:27:45

470

Views

Finding all possible paths in graph with matrix

Published on 12 Apr 2026 - 19:27

score 77 · Answer 12 · 2026-04-12 01:43:49

77

Views

A Solution from infinite solutions within a range

Published on 12 Apr 2026 - 1:43

score 846 · Answer 13 · 2026-04-14 20:00:13

846

Views

What does a dot mean in matrix element index?

Published on 14 Apr 2026 - 20:00

score 651 · Answer 14 · 2026-03-25 10:53:35

651

Views

What is the correct matrix form for transforming spherical coordinate to Cartesian?

Published on 25 Mar 2026 - 10:53

score 95 · Answer 15 · 2026-04-17 01:28:10

95

Views

Rearranging matrix

Published on 17 Apr 2026 - 1:28

List Question

Is $ (1+ |x|^2)\operatorname{Id} - x \otimes x $ positive definite?

If I subtract 1 from the n,n entry of a Pascal Matrix, why does the determinant become zero?

Does representation irreducibility ensure non-zero determinant?

Rank of an NxN matrix

Matrix power rank problem

Struggling with finding matrices such as AC = AD when C is not equal D and A has no elements equal to zero.

How to build invertible Toeplitz matrices?

Prove that a 2N × 2N Hamiltonian matrix A satisfies JAJ = transpose(A)

If $V \in \mathbb{R}^{n \times n}$ is an orthogonal matrix, and $V^T e=0$, ($e$ is the ones vector) then is it true $V_m^T e = 0\, \forall \, m<n$?

$p$-roots of the identity on SO($n$)

Finding all possible paths in graph with matrix

A Solution from infinite solutions within a range

What does a dot mean in matrix element index?

What is the correct matrix form for transforming spherical coordinate to Cartesian?

Rearranging matrix

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