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A comment on Warp Drive May Be More Feasible Than Thought, Scientists Say. Parent comment

Re:Warp Drive May Be More Feasible Than Thought, Scientists Say by Dylan16807 on Tuesday September 18, 2012 @06:40PM (#4540913)
Well, either one can send a single message. It's the reply from a different frame that causes trouble. In fact you can have unlimited FTL messages sent in a single reference frame. It's only when you combine multiple FTL reference frames that things get wonky.
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Re:Warp Drive May Be More Feasible Than Thought, Scientists Say by lmm on Wednesday September 19, 2012 @04:56AM (#4542751)
But if B can't send an FTL-message to A because he's going to receive an FTL-message from A in what to him is the future, that's your causality violation right there.
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Re:Warp Drive May Be More Feasible Than Thought, Scientists Say by Dylan16807 on Wednesday September 19, 2012 @01:15PM (#4544461)
Right, I should be more precise with the scenario. A cancelled-message is still a transfer of information. To avoid problems you have to set up the scenario such that only one ship would send a message no matter what. But it can be either ship, and you don't have to know which ahead of time.
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