Question

If $X^2+I$ is not invertible, it is $0$

score 115 · Answer 1 · 2026-04-15 05:09:58

115

Views

If $X^2+I$ is not invertible, it is $0$

Published on 15 Apr 2026 - 5:09

score 57 · Answer 2 · 2026-04-14 16:16:51

57

Views

Finding the eigenvalues for each value of $a \in \mathbb R$

Published on 14 Apr 2026 - 16:16

score 134 · Answer 3 · 2026-04-08 20:11:39

134

Views

Tensor-Product definition

Published on 08 Apr 2026 - 20:11

score 100 · Answer 4 · 2026-04-11 03:04:47

100

Views

Matrix $A$ cannot satisfy $A^3=5I$

Published on 11 Apr 2026 - 3:04

score 48 · Answer 5 · 2026-04-25 18:06:44

Let $\|LA-AR\|_{F}\geq\|A\|_{F}$, as $L\in M_{m\times m} ,R\in M_{n\times n},A\in M_{m\times n}$, prove: $LX-XR=Y$ as $X,Y\in M_{m\times n}$

score 209 · Answer 6 · 2026-05-10 22:30:58

209

Views

Hyperbolic space and isomorphism

Published on 10 May 2026 - 22:30

score 481 · Answer 7 · 2026-04-12 09:16:26

481

Views

Isomorphic as inner product spaces

Published on 12 Apr 2026 - 9:16

score 38 · Answer 8 · 2026-04-25 18:06:44

38

Views

How to easily find coefficents of a set of matricies to find if the set spans a linear space?

Published on 25 Apr 2026 - 18:06

score 29 · Answer 9 · 2026-04-15 10:44:43

29

Views

Midpoint of two points in a repeating space

Published on 15 Apr 2026 - 10:44

score 3.2k · Answer 10 · 2026-04-13 14:36:06

Example of a nonempty subset U of R 2 such that U is closed under addition and under taking additive inverses but U is not a subspace of R 2 .

score 48 · Answer 11 · 2026-04-13 11:51:20

48

Views

Is it possible that $A \neq B$ and $AT^{-1}(A)=BT^{-1}(B)$, where $T(\cdot)$ is linear?

Published on 13 Apr 2026 - 11:51

score 598 · Answer 12 · 2026-05-10 17:12:43

598

Views

Proof/Example of finding co-variance matrix of normalized data matrix

Published on 10 May 2026 - 17:12

score 2k · Answer 13 · 2026-05-11 09:30:04

2k

Views

How can I find the initial state vector of a Markov process, given a stochastic matrix, using eigenvectors? And when there are negative eigenvalues?

Published on 11 May 2026 - 9:30

score 191 · Answer 14 · 2026-04-12 04:23:01

191

Views

How to find where the hyperplane intersects the unit cube?

Published on 12 Apr 2026 - 4:23

score 236 · Answer 15 · 2026-04-25 19:41:12

236

Views

If $A_1,A_2,\ldots,A_m$ are distinct $n$-by-$n$ real matrices such that $A_iA_j=0$ for $i\neq j$, then $m\leq n$.

Published on 25 Apr 2026 - 19:41

List Question

If $X^2+I$ is not invertible, it is $0$

Finding the eigenvalues for each value of $a \in \mathbb R$

Tensor-Product definition

Matrix $A$ cannot satisfy $A^3=5I$

Let $\|LA-AR\|_{F}\geq\|A\|_{F}$, as $L\in M_{m\times m} ,R\in M_{n\times n},A\in M_{m\times n}$, prove: $LX-XR=Y$ as $X,Y\in M_{m\times n}$

Hyperbolic space and isomorphism

Isomorphic as inner product spaces

How to easily find coefficents of a set of matricies to find if the set spans a linear space?

Midpoint of two points in a repeating space

Example of a nonempty subset U of R 2 such that U is closed under addition and under taking additive inverses but U is not a subspace of R 2 .

Is it possible that $A \neq B$ and $AT^{-1}(A)=BT^{-1}(B)$, where $T(\cdot)$ is linear?

Proof/Example of finding co-variance matrix of normalized data matrix

How can I find the initial state vector of a Markov process, given a stochastic matrix, using eigenvectors? And when there are negative eigenvalues?

How to find where the hyperplane intersects the unit cube?

If $A_1,A_2,\ldots,A_m$ are distinct $n$-by-$n$ real matrices such that $A_iA_j=0$ for $i\neq j$, then $m\leq n$.

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