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Sep 11 at 7:18 comment added Andrew Steane In view of the fact that this answer has votes, I thought I should record the fact that I find it to be largely wrong. I have not downvoted however but simply added an answer of my own.
Apr 13, 2017 at 12:39 history edited CommunityBot
replaced http://physics.stackexchange.com/ with https://physics.stackexchange.com/
Jun 18, 2013 at 11:51 vote accept Calmarius
Jun 17, 2013 at 11:14 comment added Alfred Centauri +1. I agree that the term "proper velocity" for $\gamma_u u$ is awful since, unlike proper time and proper acceleration, it is not invariant but rather explicitly frame dependent.
Jun 17, 2013 at 10:45 history edited Pulsar CC BY-SA 3.0
added 23 characters in body
Jun 17, 2013 at 10:38 history answered Pulsar CC BY-SA 3.0