Why can we get eigenvalue through solving $det(A-\lambda I)=0$?
52621
Why is $\det(A - \lambda I)$ zero?
17394
Sign of determinant when using $det A^\top A$
149923
eigenvalues of A - aI in terms of eigenvalues of A
102152
Eigensystem, Eigenvalue doesn't output nonreal eigenvalues
84341
Can the determinant of a matrix can be made $0$?
94627
What's wrong with this derivation that $i\hbar = 0$?
4509
Proof that an involutory matrix has eigenvalues 1,-1
116539
Eigenvalues of matrix satisfying $A^2 = A$
16562
what are the eigenvalues in orthgonal matrix, How to explain?
29788
Eigenvalues of a matrix whose square equals its transpose
55377
Non-zero eigenvalues of $AA^T$ and $A^TA$
53917
Determinant of matrix exponential?
149981
Find the eigenvalues and eigenvectors with zeroes on the diagonal and ones everywhere else.
151088
Finding Matrix A from Eigenvalues and Eigenvectors (Diagonalization)
129977
Prove that $\lambda_1^2$, $\lambda_1\lambda_2$ and $\lambda_2^2$ are eigenvalues of matrix $A$
123679
General Information about Eigenvalues for an 3x3 symmetric matrix
29568
Prove that the determinant of $ A^{-1} = \frac{1}{det(A)} $- Linear Algebra