On 28 Nov 2001 15:56:31 -0500, Warp wrote...
> s1631001 <s16### [at] namtarqubacuk> wrote:
> : I was using the word tachyon to refer to a particle travelling faster
> : than local c.
> 
>   "Local c"? I think that's a misleading term as c is constant. Always.

Not really.  Why do you think that c is usually expressed as the speed of 
light in a vacuum.  The whole reason refraction works is due to changes 
in the speed of light in various materials.

c is *always* the fastest that anything can travel ina given medium, but 
the actual numerical value in km/sec (or whatever the correwct SI units 
are) varies from material to material.

Of course I could be misunderstanding what you mean.

Bye for now,
      Jamie.

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