User Portlet User Portlet

Discussions
Is this a math question or a question specific to Mathematica? If the latter, what aspect of the documentation for `Eigensystem` is causing confusion?
Hi, I agree with others that the sign does not matter here. The roots are the only values of interest. It's worthwhile -- though somewhat circular -- to calculate the characteristic polynomial as follows: Poly = Times @@ ((x - #) & /@...