From: Yury Tarasievich <yury.tarasievich at gmail.com>
Thank you very much, the charpoly doesn't abort.
There's a minor catch, though.
The result is virtually unreadable as a whole,
can't be parsed(?) or indexed(?), and there
seems to be no info on degeneration, anyway?
When I compute factor(charpoly(A,x)) I see there is a degree 4 factor
and a degree 5 factor. That is degree 5 factor causes eigenvalues to
fail.
Information on the degeneration of eigenvalues can be obtained from
the discriminant of the charpoly, without knowning the
eigenvalues. Maxima provides the resultant function, so
resultant(p,dp,x);
where
dp:diff(p,x);
p:charpoly(A,x);
Leo