How can you find all matrices A such that, for all matrices B, AB = BA?
120937
Matrices that commute with all matrices
85297
find a $3 \times 3$ matrix $A$ such that $A \neq I_3$ and $A^{197}=I_3$.
90475
Coordinate-free proof of $\operatorname{Tr}(AB)=\operatorname{Tr}(BA)$?
133482
$AB-BA$ is a nilpotent matrix if it commutes with $A$
55062
$2\times 2$ matrix $C=AB-BA$
151332
If $A,B$ have eigenvalues $\pm1$, what can I say about the eigenvalues of $AB,BA$?
140252
Matrices - Conditions for $AB+BA=0$
52882
find nonsingular matrices $B$ and $C$ that satisfy $BC+ CB= 0$
88349
Are the eigenvalues of $AB$ equal to the eigenvalues of $BA$? (Citation needed!)
3330
Square matrices, ABA = A?
105921
Why do we have $ab=ba$?
85167
When A and B are of different order given the $\det(AB)$,then calculate $\det(BA)$
128760
If $A$ and $B$ two $n\times n$ matrix such that $AB=BA$, then $\dim(A\cap B)$?
58021
Finding matrix $B$ is not zero matrix where $AB= 0$
84626
Why in these matrices are $AB=BA$ not equal? What is the logic behind them?
106986
Eigenvalues of $AB$ and $BA$
16250
If $B_1,B_2$ and $B_2,B_3$ are MUBs, can we conclude that either $B_1,B_3$ are MUBs, or they have equivalent Hadamard matrices?