Question

Is there an explicit formula for $\left(xx^T\right)^{-1}$ with $x\in\mathbb{R}^n\setminus\left\{0\right\}$?

score 37 · Answer 1 · 2015-06-29 16:05:40

37

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Is there an explicit formula for $\left(xx^T\right)^{-1}$ with $x\in\mathbb{R}^n\setminus\left\{0\right\}$?

Published on 29 Jun 2015 - 16:05

score 719 · Answer 2 · 2015-06-30 04:27:38

719

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Choosing the right sign for inverse functions?

Published on 30 Jun 2015 - 4:27

score 5.3k · Answer 3 · 2015-06-30 05:02:17

5.3k

Views

Slopes of inverse functions

Published on 30 Jun 2015 - 5:02

score 89 · Answer 4 · 2026-02-23 10:18:24

89

Views

Finding a binary operation on $\{1, \dots, n\}$ so that each $k$ has exactly $k - 1$ left inverses

Published on 23 Feb 2026 - 10:18

score 147 · Answer 5 · 2015-07-02 19:50:10

147

Views

Inverse Permutations from $S_7$

Published on 02 Jul 2015 - 19:50

score 564 · Answer 6 · 2015-07-03 21:17:22

564

Views

Is it okay to perform the same row operation twice on opposite rows?

Published on 03 Jul 2015 - 21:17

score 687 · Answer 7 · 2015-07-04 22:21:23

687

Views

To fast invert a real symmetric positive definite matrix that is almost similar to Toeplitz

Published on 04 Jul 2015 - 22:21

score 1.2k · Answer 8 · 2015-07-05 10:59:56

1.2k

Views

Find a constant so matrix is invertible

Published on 05 Jul 2015 - 10:59

score 197 · Answer 9 · 2026-03-27 05:15:47

197

Views

Finding the inverse of the function $f(k, x) = k^{x}x.$

Published on 27 Mar 2026 - 5:15

score 1.1k · Answer 10 · 2015-07-06 22:36:31

1.1k

Views

Matrix inverses - Why are they derived the way they are?

Published on 06 Jul 2015 - 22:36

score 53 · Answer 11 · 2015-07-07 22:44:05

53

Views

How do I solve for A in the matrix equation $A - B(A./C) = D$?

Published on 07 Jul 2015 - 22:44

score 840 · Answer 12 · 2015-07-08 21:29:50

840

Views

Existence of Linear Transformation between 3D line and 2D line

Published on 08 Jul 2015 - 21:29

score 193 · Answer 13 · 2026-04-03 00:29:22

193

Views

Using Least Squares to calculate a matrix in an equation.

Published on 03 Apr 2026 - 0:29

score 975 · Answer 14 · 2015-07-10 02:15:05

975

Views

Inverse of sum of 3 matrices

Published on 10 Jul 2015 - 2:15

score 34.9k · Answer 15 · 2015-07-10 07:38:12

34.9k

Views

Functions that are their own inverse.

Published on 10 Jul 2015 - 7:38

List Question

Is there an explicit formula for $\left(xx^T\right)^{-1}$ with $x\in\mathbb{R}^n\setminus\left\{0\right\}$?

Choosing the right sign for inverse functions?

Slopes of inverse functions

Finding a binary operation on $\{1, \dots, n\}$ so that each $k$ has exactly $k - 1$ left inverses

Inverse Permutations from $S_7$

Is it okay to perform the same row operation twice on opposite rows?

To fast invert a real symmetric positive definite matrix that is almost similar to Toeplitz

Find a constant so matrix is invertible

Finding the inverse of the function $f(k, x) = k^{x}x.$

Matrix inverses - Why are they derived the way they are?

How do I solve for A in the matrix equation $A - B(A./C) = D$?

Existence of Linear Transformation between 3D line and 2D line

Using Least Squares to calculate a matrix in an equation.

Inverse of sum of 3 matrices

Functions that are their own inverse.

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