List questions from matrices

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Symmetry subgroup of a cube

Published on 27 Mar 2026 - 4:25

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Use Gershgorin's theorem to show that a matrix is nonsingular

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402

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Hadamard Matrix proof for the Sylvester construction

Published on 20 Jan 2018 - 14:45

645

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If A is such that $(A+2I)^2=0$, prove that $A+I$ is invertible.

Published on 31 Mar 2026 - 21:01

130

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Necessary condition for a matrix equation to be zero

Published on 29 Mar 2026 - 16:08

55

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Recurrence equation and differential equation in one

Published on 27 Mar 2026 - 15:03

1.9k

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Matrix Columns VS Rows

Published on 25 Mar 2026 - 9:22

74

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How was this formula derived?

Published on 25 Mar 2026 - 7:23

579

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Derivative of bilinear form

Published on 29 Mar 2026 - 11:48

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Is a complex symmetric square matrix with zero diagonal diagonalizable?

Published on 28 Mar 2026 - 23:23

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Let $f(x) = x^\top Q \, x$, where $Q \in \mathbb R^{n×n}$ is NOT symmetric. Show that the Hessian is $H_f (x) = Q + Q^\top$

Published on 22 Mar 2026 - 9:01

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Are idempotent matrices always a projection matrix?

Published on 26 Mar 2026 - 4:50

68

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System of equations.

Published on 31 Mar 2026 - 12:29

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Properties of Determinants: Adding Columns Question

Published on 25 Mar 2026 - 14:15

List Question

Let $Q$ and $P$ be $n\times n$ matrix, then $PQ$ and $QP$ have the same eigenvalues

Symmetry subgroup of a cube

Use Gershgorin's theorem to show that a matrix is nonsingular

Hadamard Matrix proof for the Sylvester construction

If A is such that $(A+2I)^2=0$, prove that $A+I$ is invertible.

Necessary condition for a matrix equation to be zero

Recurrence equation and differential equation in one

Matrix Columns VS Rows

How was this formula derived?

Derivative of bilinear form

Is a complex symmetric square matrix with zero diagonal diagonalizable?

Let $f(x) = x^\top Q \, x$, where $Q \in \mathbb R^{n×n}$ is NOT symmetric. Show that the Hessian is $H_f (x) = Q + Q^\top$

Are idempotent matrices always a projection matrix?

System of equations.

Properties of Determinants: Adding Columns Question

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