David H. Burns wrote:
> thought I suppose we have to if we want to start with geometry.;)

Most things along those lines start with topology, not geometry, and then 
find that geometry comes from topology if you restrict the topology to local 
interactions.

> If I remember correctly, Einstein started with the behavior of light. 

I recall that too. Basically, "c" showed up in a bunch of physics as a 
constant without reference to the movement of the experimental setup.

-- 
   Darren New, San Diego CA, USA (PST)
   Understanding the structure of the universe
    via religion is like understanding the
     structure of computers via Tron.

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