Question

Isomorphism of subalgebras

score 90 · Answer 1 · 2018-02-11 16:53:53

90

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Isomorphism of subalgebras

Published on 11 Feb 2018 - 16:53

score 315 · Answer 2 · 2018-02-11 17:12:12

315

Views

Proof if $AB = BA$ is not verified, then $AB$ is not symmetric.

Published on 11 Feb 2018 - 17:12

score 563 · Answer 3 · 2026-03-25 00:24:27

563

Views

How to calculate $\dfrac{\partial a^{\rm T}A^{-\rm T}bb^{\rm T}A^{-1}a}{\partial A}$?

Published on 25 Mar 2026 - 0:24

score 382 · Answer 4 · 2018-02-11 20:17:48

382

Views

How to do LU Factorization?

Published on 11 Feb 2018 - 20:17

score 87 · Answer 5 · 2026-03-25 03:22:16

87

Views

Show that $A$ is invertible. Let $A$ be an $n \times n$ matrix that satisfies $A^3 +a_{2}A^2 +a_{1}A+I_{n} =0$

Published on 25 Mar 2026 - 3:22

score 212 · Answer 6 · 2018-02-11 21:47:45

212

Views

Finding a sphere tangent to 3 other spheres

Published on 11 Feb 2018 - 21:47

score 347 · Answer 7 · 2026-03-26 14:32:02

347

Views

Let C= [a b; b a]. Show that [1; 1] and [1; -1] are eigenvectors of C. What are corresponding eigenvalues?

Published on 26 Mar 2026 - 14:32

score 60 · Answer 8 · 2026-03-26 01:06:11

60

Views

How does one compute the matrix $X$ in the matrix equation, $X^{T} A X = B $?

Published on 26 Mar 2026 - 1:06

score 65 · Answer 9 · 2018-02-11 22:19:18

65

Views

Let $T:V \to U$ be an one-to-one linear transformation and $S:U \to W$ an onto linear transformation.

Published on 11 Feb 2018 - 22:19

score 110 · Answer 10 · 2018-02-11 23:27:09

110

Views

Image/Basis Question

Published on 11 Feb 2018 - 23:27

score 42 · Answer 11 · 2026-03-26 22:21:04

42

Views

Notation meaning when a matrix is equal to a vector

Published on 26 Mar 2026 - 22:21

score 3k · Answer 12 · 2026-03-29 17:33:49

3k

Views

Row Echelon Form with Zero-ed Row

Published on 29 Mar 2026 - 17:33

score 69 · Answer 13 · 2026-03-26 03:22:37

69

Views

Suppose $c: I \rightarrow O(n)$ is a smooth curve with $c(0) = \text{Id}_n$. Prove that $c'(0)$ is skew-adjoint.

Published on 26 Mar 2026 - 3:22

score 76 · Answer 14 · 2026-03-25 09:28:18

76

Views

Why is the next subgroup of $\mathrm{GL}(2,\mathbb{R})$ is closed and its Lie algebra is this?

Published on 25 Mar 2026 - 9:28

score 255 · Answer 15 · 2018-02-12 01:41:45

255

Views

Question on Rank of a matrix

Published on 12 Feb 2018 - 1:41

List Question

Isomorphism of subalgebras

Proof if $AB = BA$ is not verified, then $AB$ is not symmetric.

How to calculate $\dfrac{\partial a^{\rm T}A^{-\rm T}bb^{\rm T}A^{-1}a}{\partial A}$?

How to do LU Factorization?

Show that $A$ is invertible. Let $A$ be an $n \times n$ matrix that satisfies $A^3 +a_{2}A^2 +a_{1}A+I_{n} =0$

Finding a sphere tangent to 3 other spheres

Let C= [a b; b a]. Show that [1; 1] and [1; -1] are eigenvectors of C. What are corresponding eigenvalues?

How does one compute the matrix $X$ in the matrix equation, $X^{T} A X = B $?

Let $T:V \to U$ be an one-to-one linear transformation and $S:U \to W$ an onto linear transformation.

Image/Basis Question

Notation meaning when a matrix is equal to a vector

Row Echelon Form with Zero-ed Row

Suppose $c: I \rightarrow O(n)$ is a smooth curve with $c(0) = \text{Id}_n$. Prove that $c'(0)$ is skew-adjoint.

Why is the next subgroup of $\mathrm{GL}(2,\mathbb{R})$ is closed and its Lie algebra is this?

Question on Rank of a matrix

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