Question

Is aI + bA invertible if rank(A) = n-1?

score 123 · Answer 1 · 2026-04-14 18:07:10

123

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Is aI + bA invertible if rank(A) = n-1?

Published on 14 Apr 2026 - 18:07

score 117 · Answer 2 · 2026-04-10 17:31:11

117

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How to invert finding marginals of a rotationally symmetric distribution?

Published on 10 Apr 2026 - 17:31

score 91 · Answer 3 · 2026-04-15 10:48:39

91

Views

When is (a restriction of) the map $y = f(x) = x + \frac{n}{x}$ bijective, if $x, y \in \mathbb{Q}$ and $n \in {\mathbb{Z}}^{+} \cup \{0\}$?

Published on 15 Apr 2026 - 10:48

score 4.5k · Answer 4 · 2026-04-14 20:02:22

4.5k

Views

Reverse rows in a matrix

Published on 14 Apr 2026 - 20:02

score 70 · Answer 5 · 2026-04-12 16:54:58

70

Views

Inverting all values in matrix

Published on 12 Apr 2026 - 16:54

score 85 · Answer 6 · 2026-04-15 14:17:01

85

Views

Given the product of a unitary matrix and an orthogonal matrix, can it be easily inverted _without_ knowing these factors?

Published on 15 Apr 2026 - 14:17

score 227.3k · Answer 7 · 2026-04-11 07:28:12

227.3k

Views

Is the inverse of a symmetric matrix also symmetric?

Published on 11 Apr 2026 - 7:28

score 115 · Answer 8 · 2026-04-13 16:31:10

115

Views

How to compute $\text{trace}((A+D)^{-1}A)$

Published on 13 Apr 2026 - 16:31

score 1.3k · Answer 9 · 2026-04-10 03:41:55

1.3k

Views

Application of Matrix Diagonalization

Published on 10 Apr 2026 - 3:41

score 558 · Answer 10 · 2026-04-12 11:04:02

558

Views

Matrix Inverse Question

Published on 12 Apr 2026 - 11:04

score 105 · Answer 11 · 2026-04-16 20:18:43

105

Views

Why $ g(p) = 0.5 p^{-0.2} + 0.5 p^{-0.5} $ has a well-defined inverse that is continuous and strictly decreasing.

Published on 16 Apr 2026 - 20:18

score 883 · Answer 12 · 2026-04-13 20:06:21

883

Views

Inverse and multiplication of (symmetric, positive definite) Toeplitz matrices

Published on 13 Apr 2026 - 20:06

score 13.3k · Answer 13 · 2026-04-13 11:26:09

13.3k

Views

How to find the inverse of this exponential function?

Published on 13 Apr 2026 - 11:26

score 17.3k · Answer 14 · 2026-04-12 08:22:53

17.3k

Views

Determine if the matrix is idempotent?

Published on 12 Apr 2026 - 8:22

score 2.2k · Answer 15 · 2026-04-15 20:06:40

2.2k

Views

If a ring element is right-invertible, but not left-invertible, then it has infinitely many right-inverses.

Published on 15 Apr 2026 - 20:06

List Question

Is aI + bA invertible if rank(A) = n-1?

How to invert finding marginals of a rotationally symmetric distribution?

When is (a restriction of) the map $y = f(x) = x + \frac{n}{x}$ bijective, if $x, y \in \mathbb{Q}$ and $n \in {\mathbb{Z}}^{+} \cup \{0\}$?

Reverse rows in a matrix

Inverting all values in matrix

Given the product of a unitary matrix and an orthogonal matrix, can it be easily inverted _without_ knowing these factors?

Is the inverse of a symmetric matrix also symmetric?

How to compute $\text{trace}((A+D)^{-1}A)$

Application of Matrix Diagonalization

Matrix Inverse Question

Why $ g(p) = 0.5 p^{-0.2} + 0.5 p^{-0.5} $ has a well-defined inverse that is continuous and strictly decreasing.

Inverse and multiplication of (symmetric, positive definite) Toeplitz matrices

How to find the inverse of this exponential function?

Determine if the matrix is idempotent?

If a ring element is right-invertible, but not left-invertible, then it has infinitely many right-inverses.

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