Question

The nonexistence of a Jordan normal form over a finite field

score 1.4k · Answer 1 · 2026-03-25 10:56:55

1.4k

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The nonexistence of a Jordan normal form over a finite field

Published on 25 Mar 2026 - 10:56

score 200 · Answer 2 · 2026-03-25 06:05:19

200

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Reasonably-Good Bounding Sphere of an Affine-Transformed Sphere

Published on 25 Mar 2026 - 6:05

score 810 · Answer 3 · 2026-04-11 07:24:50

810

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Is it abuse of notation to write the hessian as $D^2f$?

Published on 11 Apr 2026 - 7:24

score 77 · Answer 4 · 2026-03-27 00:02:23

77

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Using the property of determinant, verify that

Published on 27 Mar 2026 - 0:02

score 82 · Answer 5 · 2026-03-25 17:41:54

82

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If $n$ is odd and $a_{ij} = -a_{ji}$ for all $i,j\in\{1,...,n\}$, then $A$ is not invertible. Does the statement hold also when $n$ is even?

Published on 25 Mar 2026 - 17:41

score 128 · Answer 6 · 2026-04-11 19:57:10

128

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Derivative of $\mathrm{tr}(X^\top A) A$

Published on 11 Apr 2026 - 19:57

score 154 · Answer 7 · 2026-04-11 18:58:47

154

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Inverse of a $4 \times 4$ triangular block matrix

Published on 11 Apr 2026 - 18:58

score 905 · Answer 8 · 2026-03-27 01:00:11

905

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Find a basis for the submodule $\mathbb Z^3$ consisting of all integer solutions of the system of equations $x+2y+3z=0, x+4y+9z=0$

Published on 27 Mar 2026 - 1:00

score 97 · Answer 9 · 2026-03-24 20:30:43

97

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Showing a matrix positive semidefinite

Published on 24 Mar 2026 - 20:30

score 42 · Answer 10 · 2026-04-04 23:02:34

42

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Definition of positive definiteness of $D^2$ without a choice of basis?

Published on 04 Apr 2026 - 23:02

score 1k · Answer 11 · 2026-03-25 17:37:43

1k

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Inverse of this matrix with trigonometric functions

Published on 25 Mar 2026 - 17:37

score 272 · Answer 12 · 2018-04-29 10:36:41

272

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A linear map from matrices to matrices

Published on 29 Apr 2018 - 10:36

score 1.9k · Answer 13 · 2026-03-27 00:09:49

1.9k

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Changing sign when interchanging rows of matrix

Published on 27 Mar 2026 - 0:09

score 80 · Answer 14 · 2026-03-25 23:09:32

80

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Derivative by element from inverse matrices

Published on 25 Mar 2026 - 23:09

score 50 · Answer 15 · 2018-04-29 14:51:50

50

Views

Matrix Notations

Published on 29 Apr 2018 - 14:51

List Question

The nonexistence of a Jordan normal form over a finite field

Reasonably-Good Bounding Sphere of an Affine-Transformed Sphere

Is it abuse of notation to write the hessian as $D^2f$?

Using the property of determinant, verify that

If $n$ is odd and $a_{ij} = -a_{ji}$ for all $i,j\in\{1,...,n\}$, then $A$ is not invertible. Does the statement hold also when $n$ is even?

Derivative of $\mathrm{tr}(X^\top A) A$

Inverse of a $4 \times 4$ triangular block matrix

Find a basis for the submodule $\mathbb Z^3$ consisting of all integer solutions of the system of equations $x+2y+3z=0, x+4y+9z=0$

Showing a matrix positive semidefinite

Definition of positive definiteness of $D^2$ without a choice of basis?

Inverse of this matrix with trigonometric functions

A linear map from matrices to matrices

Changing sign when interchanging rows of matrix

Derivative by element from inverse matrices

Matrix Notations

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