Is it possible for a matrix to be positive definite and have complex eigenvalues?
114208
Does non-symmetric positive definite matrix have positive eigenvalues?
29788
Eigenvalues of a matrix whose square equals its transpose
75104
Existence of some type matrix
9250
Can the zero vector be an eigenvector for a matrix?
56727
Odd-dimensional complex skew-symmetric matrix has eigenvalue $0$
80544
Need verification - Prove a Hermitian matrix $(\textbf{A}^\ast = \textbf{A})$ has only real eigenvalues
116539
Eigenvalues of matrix satisfying $A^2 = A$
146405
Norm with symmetric positive definite matrix
67686
Square root of Positive Definite Matrix
70455
Why are all nonzero eigenvalues of the skew-symmetric real matrices pure imaginary?
152831
When does a complex matrix have a square root?
125569
Prove that the eigenvalues of a real symmetric matrix are real
38878
Why are eigenfunctions which correspond to discrete/continuous eigenvalue spectra guaranteed to be normalizable/non-normalizable?
24454
The relationship between the eigenvalues of matrices $XY$ and $YX$
64741
The square root of positive definite matrix
134981
Eigenvalues of $L^\dagger L$ are positive
22754
"matrix is not positive definite" - even when highly correlated variables are removed