ITCZ,
Oh dear. Can of worms opened!
Indeed. You're no doubt referring to some of those on this site who post "do a search" more often than any other reply. Often valid, sometimes not. I suggest that the detailed response ITCZ has posted is not available in another Proon thread.
Anyhoo...
In a previous life I seem to remember doing a geeky physics degree so will use this now-very-shaky knowledge to try and get the gist of the .pdf you posted!
Thanks for your detailed reply
B&S