Implement a simple solver for eigenvalues and eigenvectors of a 3x3 matrix for the PhQ::Dyad and PhQ::SymmetricDyad classes. References: - https://en.wikipedia.org/wiki/Cubic_equation, in particular: https://en.wikipedia.org/wiki/Cubic_equation#General_cubic_formula - https://stackoverflow.com/a/13328773 - https://www.calculatorsoup.com/calculators/algebra/cubicequation.php
Implement a simple solver for eigenvalues and eigenvectors of a 3x3 matrix for the PhQ::Dyad and PhQ::SymmetricDyad classes.
References: