Question

If a matrix has eigenvalues with non-zero real parts, can the eigenvalues of its Schur complement be arbitrarily close to zero?

score 229 · Answer 1 · 2026-04-09 11:29:40

229

Views

If a matrix has eigenvalues with non-zero real parts, can the eigenvalues of its Schur complement be arbitrarily close to zero?

Published on 09 Apr 2026 - 11:29

score 325 · Answer 2 · 2026-04-12 13:02:58

325

Views

How are the discriminant of a single variable quadratic equation and that of a binary quadratic form related?

Published on 12 Apr 2026 - 13:02

score 176 · Answer 3 · 2026-04-18 04:31:53

176

Views

What is the intuition behind maximizing the smallest nonzero singular value?

Published on 18 Apr 2026 - 4:31

score 111 · Answer 4 · 2026-04-10 03:11:38

111

Views

Does $A^2 = k^2 I$ imply $A$ is diagonalizable?

Published on 10 Apr 2026 - 3:11

score 106 · Answer 5 · 2026-04-09 13:21:57

106

Views

Self-consistent non-linear eigenproblem

Published on 09 Apr 2026 - 13:21

score 240 · Answer 6 · 2026-04-10 17:43:34

240

Views

eigenvector expansion with non symmetric matrices

Published on 10 Apr 2026 - 17:43

score 542 · Answer 7 · 2026-04-10 01:21:25

542

Views

Is a $3\times 3$ Matrix with 2 Eigenvalues diagonalizable

Published on 10 Apr 2026 - 1:21

score 21 · Answer 8 · 2026-04-17 00:55:13

21

Views

what I already have is all the coordinates (x1, x2) of each point. is it possible to compute all the parameters? $\mu$, $\lambda$, u, $y_i$

Published on 17 Apr 2026 - 0:55

score 1k · Answer 9 · 2026-04-17 00:50:37

1k

Views

Largest eigenvalue of a subgraph of a graph.

Published on 17 Apr 2026 - 0:50

score 776 · Answer 10 · 2026-04-11 18:52:19

776

Views

Eigenvalue and eigenvectors of a matrix and its Hermitian conjugate

Published on 11 Apr 2026 - 18:52

score 32 · Answer 11 · 2026-04-08 09:06:50

32

Views

Conjugacy classes of $\mathop{\mathrm{GL}}_{10}(\mathbb{Q})$ with certain minimal polynomial

Published on 08 Apr 2026 - 9:06

score 339 · Answer 12 · 2026-03-25 16:02:20

339

Views

Find maximum and minimum of a quadratic form on an $n$-dimensional sphere

Published on 25 Mar 2026 - 16:02

score 52 · Answer 13 · 2026-03-27 21:17:54

52

Views

Positive diagonal entries in $2 \times 2$ matrix

Published on 27 Mar 2026 - 21:17

score 89 · Answer 14 · 2026-03-26 22:14:03

89

Views

Symmetric matrices and the sign of the eigenvalues.

Published on 26 Mar 2026 - 22:14

score 148 · Answer 15 · 2026-03-27 21:23:36

148

Views

Matrix with only eigenvalues = 1

Published on 27 Mar 2026 - 21:23

List Question

If a matrix has eigenvalues with non-zero real parts, can the eigenvalues of its Schur complement be arbitrarily close to zero?

How are the discriminant of a single variable quadratic equation and that of a binary quadratic form related?

What is the intuition behind maximizing the smallest nonzero singular value?

Does $A^2 = k^2 I$ imply $A$ is diagonalizable?

Self-consistent non-linear eigenproblem

eigenvector expansion with non symmetric matrices

Is a $3\times 3$ Matrix with 2 Eigenvalues diagonalizable

what I already have is all the coordinates (x1, x2) of each point. is it possible to compute all the parameters? $\mu$, $\lambda$, u, $y_i$

Largest eigenvalue of a subgraph of a graph.

Eigenvalue and eigenvectors of a matrix and its Hermitian conjugate

Conjugacy classes of $\mathop{\mathrm{GL}}_{10}(\mathbb{Q})$ with certain minimal polynomial

Find maximum and minimum of a quadratic form on an $n$-dimensional sphere

Positive diagonal entries in $2 \times 2$ matrix

Symmetric matrices and the sign of the eigenvalues.

Matrix with only eigenvalues = 1

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