Compute eigenvalue of a $4\times4$ matrix with all entries $1$
2271
Determinant of a rank $1$ update of a scalar matrix, or characteristic polynomial of a rank $1$ matrix
1024
Extract four (von Neumann) neighbors of a matrix entry
127799
Eigenvalues of symmetric matrices are real without (!) complex numbers
153392
Let $A$ be a $n\times n$ matrix such that $a_{ij}=ij$,find the eigenvalues of the matrix $A$.
81275
Eigenvalue Problem -- prove eigenvalue for $A^2 + I$
125569
Prove that the eigenvalues of a real symmetric matrix are real
135316
A basic question on diagonalizability of a matrix
7376
Find $\det(A^{2}+A^{T})$ when eigenvalues are $1,2,3$
106024
The eigenvalues and corresponding eigenvectors for the matrix
73952
Upper bound for the sum of absolute values of the eigenvalues
157246
Adjoint matrix eigenvalues and eigenvectors
29788
Eigenvalues of a matrix whose square equals its transpose
59235
Finding eigenvalues of a differential operator
59402
Comparing Eigenvalues of Positive Semidefinite Matrices
10014
Is there a built-in procedure for simultaneous diagonalization of a set of commuting matrices?
4917
Inverse of this $3\times 3$ matrix using the Cayley–Hamilton theorem
126337
Eigenvalues in orthogonal matrices