Doubts regarding adjoint of matrices
89177
$\operatorname{adj}(AB) = \operatorname{adj} B \operatorname{adj} A$
99942
A normal, idempotent linear operator must be self-adjoint
39430
Orthogonal matrix and orthonormal columns
156985
Question Concerning Vectors
84626
Why in these matrices are $AB=BA$ not equal? What is the logic behind them?
40478
If $C$ commutes with certain matrices $A$ and $B$, why is $C$ a scalar multiple of the identity?
73027
Questions on symmetric matrices
29470
Problem involving Derivative and Antiderivative operators in Hoffman and Kunze's Linear Algebra
27821
A problem on rank of $A$ and $\operatorname{adj}(A)$
128723
The determinant of adjugate matrix
111911
Dimensions of symmetric and skew-symmetric matrices
28719
Question about Angle-Preserving Operators
70606
Show that the LU decomposition of matrices of the form $\left[\begin{smallmatrix}0& x\\0 & y\end{smallmatrix}\right]$ is not unique
125889
Determinant of rank-one perturbations of (invertible) matrices
70021
Verify if symmetric matrices form a subspace
86150
Geometric interpretation of matrices
155275
If two real matrices are conjugated over $\mathbb{C}$, are they then also conjugated over $\mathbb{R}$?