Matrices which commute with all the matrices commuting with a given matrix
25357
Matrices $B$ that commute with every matrix commuting with $A$
29788
Eigenvalues of a matrix whose square equals its transpose
121062
Given a matrix, is there always another matrix which commutes with it?
136640
Can you completely permute the elements of a matrix by applying permutation matrices?
55159
Find all matrices that commute with given matrix
153961
Determinant of $2 \times 2$ block matrix with commuting blocks
66842
Number of $n^2\times n^2$ permutation matrices with a 1 in each $n\times n$ subgrid
123044
Commutative matrices are multiples of the identity
19132
Similar matrices have the same eigenvalues with the same geometric multiplicity
44898
Help with commutative property of matrices problem
67990
Commutativity of matrix and its transpose
158264
Rotation of Matrices and their interpretation
40478
If $C$ commutes with certain matrices $A$ and $B$, why is $C$ a scalar multiple of the identity?
43570
Finding two non-zero matrices where $AX = BA$
95227
Is the set of all $n\times n$ matrices, such that for a fixed matrix B  AB=BA, a subspace of the vector space of all $n\times n$ matrices?
33955
Geometric series of matrices
6659
Approximating commuting matrices by commuting diagonalizable matrices