Eigenvalues of $AB$ and $BA$ ${}\qquad{}$
88349
Are the eigenvalues of $AB$ equal to the eigenvalues of $BA$? (Citation needed!)
135420
Determining eigenvalues, eigenvectors of $A\in \mathbb{R}^{n\times n}(n\geq 2)$.
141173
Are there matrices such that $AB=I$ and $BA \neq I$
9220
If $\lambda$ is an eigenvalue of $A^2$, then either $\sqrt{\lambda}$ or $-\sqrt{\lambda}$ is an eigenvalue of $A$
6091
Similarity of products $AB$ and $BA$ of square matrices
124583
A question about eigenvalues of $5\times5$ matrix
109471
The eigenvectors of the transpose operator
1398
Find eigen values of $B = \begin{bmatrix} 0 & A^* \\ A &0 \end{bmatrix}$
86125
If $A$ is idempotent, then the eigenvalues of $A$ are $0$ or $1$
42799
Let $x$ and $y$ be two non-zero $n × 1$ vectors. If $y^T$ denotes the transpose of $y$, what are the eigenvalues of the $n × n$ matrix $xy^T$
119387
If $A$ is any matrix then $A^*A$ and $AA^*$ are Hermitian with non-negative eigenvalues
106024
The eigenvalues and corresponding eigenvectors for the matrix
96811
How to find the eigenvalues of a block-diagonal matrix?
127799
Eigenvalues of symmetric matrices are real without (!) complex numbers
17032
If $ab=ba$, Prove $a^2$ commutes with $b^2$
66709
Are the matrix products $AB$ and $BA$ similar?
30882
Proving Invertibility and Eigenvalues