How can I determine all the matrix A 3x3 in R such as AB=BA for all B 3x3 in R (without determinants)
4280
A linear operator commuting with all such operators is a scalar multiple of the identity.
64425
Block matrix determinant formula
134244
Determinant of a matrix will all off-diagonal elements equal
140290
Solving $AB - BA = C$
120937
Matrices that commute with all matrices
40517
Determinant of a non-square matrix
30358
Finding Jordan basis of a matrix ($3\times3$ example)
10793
How to compute the determinant of a tridiagonal matrix with constant diagonals?
128646
$S$ is a $3\times 3$ real matrices. Then $S$ contains which matrices
153961
Determinant of $2 \times 2$ block matrix with commuting blocks
141287
General method to find submatrix in matlab matrix
74088
Completing a 3x3 correlation matrix: two coefficients of the three given
62283
How can I quickly know the rank of this / any other matrix?
50732
How to determine direct solution of determinant?
59397
Eigenvalues of $AB$ and $BA$ where $A$ and $B$ are square matrices
11397
How do I write this matrix as a product of elementary row matrices.
84871
Determining the dimension of span$\{AB-BA : A,B \in M_{n \times n}(\mathbb R) \}$