$2\times 2$ real matrix with exactly one eigenvalue
133036
Jordan normal form and invertible matrix of generalized eigenvectors proof
10828
If $A^2 = I$, then $A$ is diagonalizable, and is $I$ if $1$ is its only eigenvalue
32103
Show that for a $2\times 2$ matrix $A^2=0$
136643
Continuity of eigenvalues and spectral radius for a general matrix
45527
Do real matrices always have real eigenvalues?
58595
Existence of a G-invariant matrix
41932
Prove that $\lambda = 0$ is an eigenvalue if and only if A is singular.
63753
Eigenvalues of product of two complex matrices
125569
Prove that the eigenvalues of a real symmetric matrix are real
135420
Determining eigenvalues, eigenvectors of $A\in \mathbb{R}^{n\times n}(n\geq 2)$.
20331
Determinant of a $2\times 2$ block matrix
55062
$2\times 2$ matrix $C=AB-BA$
98541
If a Matrix Has Only Zero as an Eigen-Value Then It Is Nilpotent
4517
Showing a $2\times2$ matrix is invertible
129743
$A$ be a $2\times 2$ real matrix with trace $2$ and determinant $-3$
154666
similar matrices have same eigenvalue... stuck
149629
The Eigenvalues of a block matrix