Re: Algebra of Einstein velocity addition

*To*: mathgroup at smc.vnet.net*Subject*: [mg53924] Re: Algebra of Einstein velocity addition*From*: Paul Abbott <paul at physics.uwa.edu.au>*Date*: Fri, 4 Feb 2005 04:11:20 -0500 (EST)*Organization*: The University of Western Australia*References*: <ctai4a$c0d$1@smc.vnet.net> <ctfv3d$pdi$1@smc.vnet.net> <ctnhtg$et9$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

In article <ctnhtg$et9$1 at smc.vnet.net>, "Dr. Wolfgang Hintze" <weh at snafu.de> wrote: > Paul, > > thanks for your comprehensive answers. > > Unfortunately, I'm having difficulties finding the article you mentioned > (The Mathematica Journal 8(3) page 402) on the internet. As I'm > subscriber I can find vol. 8, 3 but I'm stuck with "page 402". > Could you please tell me title and author of the article? It was in the In and Out column under the section entitled Associativity (which starts on page 400 in the printed version). Cheers, Paul > Paul Abbott wrote: > > > In article <ctai4a$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] > -- Paul Abbott Phone: +61 8 6488 2734 School of Physics, M013 Fax: +61 8 6488 1014 The University of Western Australia (CRICOS Provider No 00126G) 35 Stirling Highway Crawley WA 6009 mailto:paul at physics.uwa.edu.au AUSTRALIA http://physics.uwa.edu.au/~paul