trying to get orkut to send you an invite presently... i'm at two "502 server errors" so far and counting. and i was expecting at least half a dozen, so i may be up all night doing this...;-) that's what i meant by you may not thank me!
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"