Re: Algebra of Einstein velocity addition

*To*: mathgroup at smc.vnet.net*Subject*: [mg53871] Re: Algebra of Einstein velocity addition*From*: "Dr. Wolfgang Hintze" <weh at snafu.de>*Date*: Tue, 1 Feb 2005 04:08:21 -0500 (EST)*References*: <ctai4a$c0d$1@smc.vnet.net> <ctfv3d$pdi$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Paul, thanks for your comprehensive answers. Unfortunately, I'm having difficulties finding the article you mentioned (The Mathematica Journal 8(3) page 402) on the internet. As I'm subscriber I can find vol. 8, 3 but I'm stuck with "page 402". Could you please tell me title and author of the article? Thanks and regards, Wolfgang ) Paul Abbott wrote: > In article <ctai4a$c0d$1 at smc.vnet.net>, > "Dr. Wolfgang Hintze" <weh at snafu.de> wrote: > [snip] > > In special relativity, the (vector) rapidity parameter, Xi, is defined by > > Xi = v/Norm[v] ArcTanh[Norm[v]] > > where the vector v is the relative velocity (in units where c = 1) > between moving reference frames (see The Mathematica Journal 8(3) page > 402). [snip]