clipka wrote:
> Kevin Wampler schrieb:
>> Just a quick pedantic note to the otherwise good explanation -- since 
>> the light beams in his example are arriving at the same point, z, he 
>> can of course be sure what "arrive at the same time" means.
> 
> As for /arriving/ at the same time: Yes. As for being /sent/ at the same 
> time: No.

Good point, I was implicitly taking x and y to be coincident at the time 
of the light emission, but reading again this was an unjustified 
assumption on my part.

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