Table of Contents - 11.5. The characteristic polynomial
According to Wikipedia ("Characteristic polynomial", 31-Jul-2019,
https://en.wikipedia.org/wiki/Characteristic_polynomial): "In linear
algebra, the characteristic polynomial of a square matrix is a polynomial
which is invariant under matrix similarity and has the eigenvalues as roots.
It has the determinant and the trace of the matrix as coefficients.". Based
on the definition of the characteristic polynomial of a square matrix
(df-chpmat) the eigenvalues and corresponding eigenvectors can be
defined.