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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]