I think that sounds a good idea; but can we call the parameter
"extend" and not "base_extend"? First, as that is less frightening
for users (who will need examples to show that for a real matrix, if
you want complex eigenvalues you have to ask for them), and also for
consistency with (for example
During the discusion about ticket 8974
https://webmail.unizar.es/horde/imp/login.php
i noted that the behaviour of eigenvectors, eigenspaces and
eigenvalues method of matrices is not mathematically correct. Or being
more precise, it does not translate directly into mathematically
correct methods fo
