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Widawensen
  • Member for 7 years, 10 months
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21 votes

Finding the 10th root of a matrix

8 votes

Complex matrix decomposition into the sum of a diagonalizable and a nilpotent matrix.

8 votes
Accepted

Relation between rank and number of distinct eigenvalues

7 votes
Accepted

Orthogonal matrix and orthonormal columns

6 votes

Rank of an Involutory Matrix

6 votes

Is the zero matrix the only symmetric, nilpotent matrix with real values?

6 votes

Determinant of anti-circulant matrix

6 votes

Do commuting matrices share the same eigenvectors?

6 votes
Accepted

What is the geometrical meaning of symmetric matrix

5 votes

Why does rotation preserve angles and distance in the Euclidean plane?

5 votes

Effect of adding a zero row and column on the eigenvalues of a matrix

5 votes
Accepted

Is there a $4\times4$ matrix $A$ such that $\det(A) = a^4+b^4+c^4+d^4$?

5 votes

Inverse of an invertible upper triangular matrix of order 3

5 votes

$2\times2$ matrices are not big enough

5 votes
Accepted

Mathematical operator to extract diagonal elements of a square matrix

5 votes
Accepted

Is this a family of similar matrices $\left(\begin{smallmatrix} 0&x\\ 0&0 \end{smallmatrix}\right)$?

4 votes
Accepted

Let $\text{trace}(AM)\ge0$ where $M$ is psd, is $\text{trace}(A)\ge0$?

4 votes

Are these two equalities equivalent: $ABA=0$ and $BA=0$?

4 votes
Accepted

Converting from rotation matrices to axis angle at $\pi$

4 votes

Why is eigendecomposition $V \Lambda V^{-1}$ not $V^{-1} \Lambda V$

4 votes

Distance of ellipse to the origin

4 votes

Why is the product of two rotation matrices not commutative?

4 votes
Accepted

How many $3 \times 3$ integer matrices are orthogonal?

4 votes

Is it possible to have three real numbers that have both their sum and product equal to $1$?

4 votes

Let $A \in \Bbb M_3(\Bbb R)$ be such that $A^4= I, A \neq \pm I.$ Then is it true that $A^2 + I=0$?

4 votes

explicit description of eigenvector of a rotation

3 votes
Accepted

A property of orthogonal matrices

3 votes

If a matrix is symmetric then, is similar matrix symmetric also?

3 votes

Prove that matrix can be square of matrix with real entries

3 votes
Accepted

Eigenvalues of a matrix product

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