[donh]

Don, just between you and me ... are you retarded?

Just between you and me have you ever maintained a civil tongue in your head for more than a few seconds in a row?

[apochromat]

Hey, you self-described improper cretin, if you are going to criticize me before I say a thing to you, then at least present a reason.

Sheeeesh, what a bunch a dingleberries.

[apochromat]

You're just another guy like Physicist and balrog, acting the weasels and jerking me around. When are you guys going to see that your tales of reasonableness and politeness are getting way too threadbare? Go ahead, cover your offensive with your pretense of noble intent, then, as Judge Judy says, "Don't pee on my leg and tell me it's raining!"

[balrog666]

I thought it was amusing that he presupposes an FTL "signal" and then wants Physicist to tell him how it would interact in the real universe. And the kicker was the signal itself was unspecified - shall we assume strange photons, tachyons, or perhaps some large clay tablets?

Of course, the online persona he has adopted for his posts is also good for a laugh. Once anyway.

[apochromat]

Posted by OBAFGKM to apochromat
#155 of 432

"My understanding is FTL effects need not violate causality."

The problem comes with relativity. Suppose that an observer determines that event "A" is in some way the "cause"
of event "B." If FTL communication is possible, then relativity allows the existence of another observer who sees "B"
as occuring in "A's" past, i.e., as the effect having preceded the cause.

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(don, I've no argument here with this poster, becuase he's not obnoxious and he's being helpful.)

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Posted by Physicist to apochromat
#163 of 432

In a Wheeler-Feynman sort of way, I suppose.

No, in a Jack Finney-H.G. Wells sort of way. OBAFGKM already showed you that if Alice sends an FTL signal (event "A")
to an observer Bob (event "B"), and Bob is travelling towards Alice sufficiently fast, event "B" will occur before event "A"
in Bob's frame. That means that in Bob's frame, his line of simultaneity intersects Alice's location at an earlier time than she
sent it. So if Bob bounces this FTL signal back to Alice, it will arrive at her location before she actually sent it.

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WTH?????? Blah! My leg is wet after that humper.