Question

No of matrices of rank 3

score 131 · Answer 1 · 2026-03-22 01:51:22

131

Views

No of matrices of rank 3

Published on 22 Mar 2026 - 1:51

score 64 · Answer 2 · 2026-03-25 01:17:39

64

Views

Do the two linear operators on $M_n(\mathbb R)$ have the same induced norm on the subspace of symmetric matrices?

Published on 25 Mar 2026 - 1:17

score 103 · Answer 3 · 2018-09-28 04:57:04

103

Views

Under what conditions does $A \succeq B \succeq 0$ imply $A^2 \succeq B^2$?

Published on 28 Sep 2018 - 4:57

score 810 · Answer 4 · 2018-10-04 14:27:01

810

Views

The eigenvalues of $\begin{pmatrix}0&A\\A^*&0\\ \end{pmatrix}$ are the singular values of $A$ along with the negative signs.

Published on 04 Oct 2018 - 14:27

score 372 · Answer 5 · 2018-10-10 01:20:51

372

Views

Differentiability of largest eigenvalue for a $C^1$ function

Published on 10 Oct 2018 - 1:20

score 91 · Answer 6 · 2018-10-11 14:27:22

91

Views

Let A,B be nxn matrix If $(A^2)(B^2) = (B^2)(A^2)$ , is $AB=BA$?

Published on 11 Oct 2018 - 14:27

score 483 · Answer 7 · 2018-10-12 00:59:50

483

Views

Are the real and imaginary parts of an invertible matrix has to be invertible too?

Published on 12 Oct 2018 - 0:59

score 48 · Answer 8 · 2026-03-22 06:22:40

48

Views

A guess about invertible sign matrix

Published on 22 Mar 2026 - 6:22

score 54 · Answer 9 · 2018-10-15 03:43:41

54

Views

$ \begin{bmatrix} D_1 & C \\ C^T & D_2 \\ \end{bmatrix} $ always positive semidefinite?

Published on 15 Oct 2018 - 3:43

score 45 · Answer 10 · 2018-10-16 06:47:14

45

Views

Injectivity and inverse of the map $A \mapsto A_c$, the map sending a matrix to its companion form

Published on 16 Oct 2018 - 6:47

score 35 · Answer 11 · 2018-10-28 14:20:42

35

Views

$A$ is irreducible doubly non-negative, then $rank(A) \geq n-1$.

Published on 28 Oct 2018 - 14:20

score 1.1k · Answer 12 · 2018-10-29 19:21:46

1.1k

Views

Classification of $n\times n$ real matrices up to congruence

Published on 29 Oct 2018 - 19:21

score 367 · Answer 13 · 2026-03-22 13:17:04

367

Views

Eigenvalues of an adjacency matrix

Published on 22 Mar 2026 - 13:17

score 452 · Answer 14 · 2026-03-22 18:26:04

452

Views

linear combination of some matrices is identity matrix

Published on 22 Mar 2026 - 18:26

score 96 · Answer 15 · 2026-03-22 17:59:50

96

Views

A matrix inequality involving pseudoinverse

Published on 22 Mar 2026 - 17:59

List Question

No of matrices of rank 3

Do the two linear operators on $M_n(\mathbb R)$ have the same induced norm on the subspace of symmetric matrices?

Under what conditions does $A \succeq B \succeq 0$ imply $A^2 \succeq B^2$?

The eigenvalues of $\begin{pmatrix}0&A\\A^*&0\\ \end{pmatrix}$ are the singular values of $A$ along with the negative signs.

Differentiability of largest eigenvalue for a $C^1$ function

Let A,B be nxn matrix If $(A^2)(B^2) = (B^2)(A^2)$ , is $AB=BA$?

Are the real and imaginary parts of an invertible matrix has to be invertible too?

A guess about invertible sign matrix

$ \begin{bmatrix} D_1 & C \\ C^T & D_2 \\ \end{bmatrix} $ always positive semidefinite?

Injectivity and inverse of the map $A \mapsto A_c$, the map sending a matrix to its companion form

$A$ is irreducible doubly non-negative, then $rank(A) \geq n-1$.

Classification of $n\times n$ real matrices up to congruence

Eigenvalues of an adjacency matrix

linear combination of some matrices is identity matrix

A matrix inequality involving pseudoinverse

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