Re: speed of light versus c, again

argon wrote: 
it seams that the most selfestablished around here
still consider c the speed of light in vacuum as the max
speed in anywhere

Certainly not -- you got it wrong. But c is the _local_ limiting speed for any material, energy, or information transfer. And my "c" is not necessarily the speed of light, but rather is the invariant speed of the Lorentz group.


but they know they are wrong becus group velocity can
reach infinity

Sure. So can phase velocity. So what? -- the front velocity of any EM wave never exceeds c, and both energy and information transfer travel at the front velocity.


Tom Roberts	tjroberts@xxxxxxxxxx
.

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