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    $\begingroup$ Excellent answer! This is one of the best explantions (in a single place) ive come across yet!!!! :D $\endgroup$
    – user122066
    Commented Jul 9, 2016 at 17:29
  • 3
    $\begingroup$ Ive asked the followup question on the subtleties between #3 and #4 $\endgroup$
    – user122066
    Commented Jul 9, 2016 at 17:35
  • $\begingroup$ physics.stackexchange.com/q/267175/122066 $\endgroup$
    – user122066
    Commented Jul 9, 2016 at 17:37
  • $\begingroup$ @user122066 See the update at the end of my answer for links to my follow-ups. $\endgroup$
    – tparker
    Commented Jul 14, 2016 at 4:43