number of non-zero, distinct, eigen values
86875
Finding the null space of symmetric matrix generated by outer product
32064
Zero-dimensional matrices
53993
Can Eigenvalues[] and Eigenvectors[] be assumed to return the same ordering?
123679
General Information about Eigenvalues for an 3x3 symmetric matrix
108132
How Do I Compute the Eigenvalues of a Small Matrix?
146293
Calculating the eigenvalues of a matrix
123803
If $X^n$ is a diagonal matrix with distinct eigenvalues, then is $X$ also a diagonal matrix with distinct eigenvalues?
7612
How can I compute eigenvalues or characteristic polynomial of this matrix? Please help.
27865
What is the number of invertible $n\times n$ matrices in $\operatorname{GL}_n(F)$?
40222
Matrices that are not diagonal or triangular, whose eigenvalues are the diagonal elements
110271
Given a matrix with non-negative real entries, can you algebraically prove that it has a non-negative eigenvalue?
68132
Small positive eigenvalues found for a negative definite matrix
151276
Computing polynomial eigenvalues in Mathematica
38878
Why are eigenfunctions which correspond to discrete/continuous eigenvalue spectra guaranteed to be normalizable/non-normalizable?
55377
Non-zero eigenvalues of $AA^T$ and $A^TA$
1048
Discreteness of set of energy eigenvalues
102152
Eigensystem, Eigenvalue doesn't output nonreal eigenvalues