23:03 <+andrewl_> looking for algorithm to reduce quadratic form to as few
                  variables as possible (new fewer variables expressed linearly
                  in terms of the old variables), anybody leads?
...
23:16 <+evilgeek> andrewl_: the easy way is to find the eigendecomposition and
                  thne just pick the eigenvectors corresponding to nonzero
                  eigenvalues.
23:16 <@cyby> I just look at the endpoints.
23:16 <+evilgeek> andrewl_: i suspect that you can also fiddle around with the
                  cholesky decomposition.
23:16 -!- Mancha is now known as DaMancha
23:16 <+evilgeek> andrewl_: too lazy to figure out the details, though.  sorry.