Date: Tue, 12 Dec 1995 23:52:34 -0200
Message-Id: <199512130152.XAA03947@panther.unisys.com.br>
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To: John Cowan <cowan@LOCKE.CCIL.ORG>
From: "Paulo S.L.M. Barreto" <pbarreto@uninet.com.br>
Subject: Re: PLI: aspects of <clivu>
Status: OR
X-From-Space-Date: Tue Dec 12 21:05:55 1995
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la stivn. cusku di'e
> In space-time the time dimension has a Sqrt[-1]
> factor when you take the sqrt of the sum of the squares of the differences
> ofthe time-space coordinates as the distance between events.

This is the old-fashioned Minkowski space-time convention. It's better to use
real coordinates in a metric with signature {-1, -1, -1, 1}: this not only
simplifies
general relativity calculations, but is also somehow more intuitive (after
all, physical measurements always refer to real quantities).

la djan. cusku di'e
>Lojban list once spent a >year< discussing relativistic spacetime

What a pity! I wasn't here to follow that thread. Sigh...

co'o mi'e paulos.