List questions from matrices

Published on 25 Mar 2026 - 10:15

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$AB = C$, prove if $C$ is invertible, then $A$ and $B$

Published on 25 Mar 2026 - 1:26

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I wonder what is really a reducible matrix?

Published on 04 Apr 2026 - 17:30

134

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Prove that n is a multiple of $16$.

Published on 04 Apr 2026 - 17:30

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Finding matrices with $A_1^{-1}+A_2^{-1}+\dots+A_k^{-1}=(A_1+A_2+\dots+A_k)^{-1}$

Published on 25 Mar 2026 - 6:34

168

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Show that $\det(A^3+B^3)$ is the sum of two cubes of integers

Published on 04 Apr 2026 - 17:34

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Gaussian Elimination without pivot

Published on 27 Mar 2026 - 2:07

303

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Comparing positive definite matrices and their inverses

Published on 03 Apr 2026 - 10:44

163

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Equality in matrix norm equation.

Published on 27 Mar 2026 - 0:00

398

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The isotropic cone of a positive semi-definite bilinear is a subspace of $\Bbb R^n$.

Published on 24 Mar 2026 - 17:31

54

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triangle inequality-ish property misunderstood, simple proof

Published on 27 Mar 2026 - 0:01

858

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Envelope of a matrix

Published on 08 Mar 2018 - 18:26

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Unitary matrices are invertible.

Published on 04 Apr 2026 - 7:14

173

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Norm of the inverse of an M-matrix.

Published on 27 Mar 2026 - 0:04

224

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How do you solve $\dot{X} = UX$?

Published on 01 Apr 2026 - 4:24

List Question

Rewrite matrix derivative with element-wise

$AB = C$, prove if $C$ is invertible, then $A$ and $B$

I wonder what is really a reducible matrix?

Prove that n is a multiple of $16$.

Finding matrices with $A_1^{-1}+A_2^{-1}+\dots+A_k^{-1}=(A_1+A_2+\dots+A_k)^{-1}$

Show that $\det(A^3+B^3)$ is the sum of two cubes of integers

Gaussian Elimination without pivot

Comparing positive definite matrices and their inverses

Equality in matrix norm equation.

The isotropic cone of a positive semi-definite bilinear is a subspace of $\Bbb R^n$.

triangle inequality-ish property misunderstood, simple proof

Envelope of a matrix

Unitary matrices are invertible.

Norm of the inverse of an M-matrix.

How do you solve $\dot{X} = UX$?

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