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wedrifid comments on Harry Potter and the Methods of Rationality discussion thread, part 7 - Less Wrong
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Such loops are stable even without any paradox. The extent to which one can deduce whether bad things happen depends on the psychology of the individual and existing priors.
But so is this. A message 'Abort! X, Y and Z bad things will happen if you try!' can be reproduced and sent back in time perfectly well - and this kind of thing has been observed already in MoR.
Have we had the version with X, Y and Z listed? (I agree that we have had Abort! messages reproduced and sent.)
No, haven't. This seems to indicate a failure of rationality of the part of the time turner users. :)
They may be trying to avoid sending more information than necessary into the past, since there are known limitations on that. (No information can be sent more than 6 hours in the past, even through a sequence of time-turners.) I can't think of a situation where it would be safe to send the information that something has gone wrong but not the information about how, and maybe they can't either, but they could just be playing it safe.