Question

Are these row operations correct?

score 118 · Answer 1 · 2026-04-15 18:03:51

118

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Are these row operations correct?

Published on 15 Apr 2026 - 18:03

score 1.5k · Answer 2 · 2026-04-23 05:49:21

1.5k

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Given the transformation $T:\Bbb R^5 \to\Bbb R^2$ where $T(x) = Ax$, how many rows and columns does matrix $A$ have?

Published on 23 Apr 2026 - 5:49

score 248 · Answer 3 · 2026-04-15 08:43:27

248

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The proportion of $2 \times 2$ non-singular matrix whose terms are either $0$ or $1$ is

Published on 15 Apr 2026 - 8:43

score 695 · Answer 4 · 2026-04-22 22:23:03

695

Views

How do you find all solutions to the matrix equation $XAX=A^T$?

Published on 22 Apr 2026 - 22:23

score 40 · Answer 5 · 2026-04-15 10:18:01

Consider the straight lines in xy plane $ax+by+c=0, bx+cy+a=0, cx+ay+b=0$. These lines intersect at point if and only if $a+b+c=0$

score 47 · Answer 6 · 2026-04-16 15:57:33

47

Views

If there are $6$ matrices in $M_{6,6}(\Bbb C)$ such that they all satisfy $A^2=0$, does this imply that at least two of them are similar?

Published on 16 Apr 2026 - 15:57

score 104 · Answer 7 · 2026-04-16 06:29:12

104

Views

Quick and elegant explanation of $B^T A B x = 0 \Rightarrow x = 0$ with $A$ symmetric and $\mathcal R(B) = \mathcal R(A)$.

Published on 16 Apr 2026 - 6:29

score 144 · Answer 8 · 2026-04-11 21:38:45

144

Views

Who coined the term "(Non)Derogatory Matrices"?

Published on 11 Apr 2026 - 21:38

score 488 · Answer 9 · 2026-04-15 09:37:36

488

Views

Derivative of symmetric matrix (function of symmetric matrix) w.r.t. its unique elements

Published on 15 Apr 2026 - 9:37

score 44 · Answer 10 · 2026-04-12 09:43:50

44

Views

Determining whether a matrix is unitary when given its eigenspaces

Published on 12 Apr 2026 - 9:43

score 774 · Answer 11 · 2026-04-20 13:11:58

774

Views

$l_2 \rightarrow l_\infty$ induced matrix norm

Published on 20 Apr 2026 - 13:11

score 100 · Answer 12 · 2026-04-15 09:22:24

100

Views

Some confusion regarding Jordan block form of a matrix

Published on 15 Apr 2026 - 9:22

score 18.5k · Answer 13 · 2026-04-14 14:06:54

18.5k

Views

Derivative of product of matrix by vector

Published on 14 Apr 2026 - 14:06

score 44 · Answer 14 · 2026-04-09 17:50:06

44

Views

How to solve a n-dimensional matrix equation involving a matrix and its transpose?

Published on 09 Apr 2026 - 17:50

score 56 · Answer 15 · 2026-03-24 20:40:08

56

Views

Equivalence between the SDP and the given problem

Published on 24 Mar 2026 - 20:40

List Question

Are these row operations correct?

Given the transformation $T:\Bbb R^5 \to\Bbb R^2$ where $T(x) = Ax$, how many rows and columns does matrix $A$ have?

The proportion of $2 \times 2$ non-singular matrix whose terms are either $0$ or $1$ is

How do you find all solutions to the matrix equation $XAX=A^T$?

Consider the straight lines in xy plane $ax+by+c=0, bx+cy+a=0, cx+ay+b=0$. These lines intersect at point if and only if $a+b+c=0$

If there are $6$ matrices in $M_{6,6}(\Bbb C)$ such that they all satisfy $A^2=0$, does this imply that at least two of them are similar?

Quick and elegant explanation of $B^T A B x = 0 \Rightarrow x = 0$ with $A$ symmetric and $\mathcal R(B) = \mathcal R(A)$.

Who coined the term "(Non)Derogatory Matrices"?

Derivative of symmetric matrix (function of symmetric matrix) w.r.t. its unique elements

Determining whether a matrix is unitary when given its eigenspaces

$l_2 \rightarrow l_\infty$ induced matrix norm

Some confusion regarding Jordan block form of a matrix

Derivative of product of matrix by vector

How to solve a n-dimensional matrix equation involving a matrix and its transpose?

Equivalence between the SDP and the given problem

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