5) I found the idea that foreknowledge machines would end war intriguing. You are right that countries that go to war generally (but not always) do so because they disagree about what the outcome will be. But it seems to me--perhaps I have misunderstood what you are trying to say here--that outcomes that depend on the human use of information about the future are precisely the kind that a foreknowledge machine couldn't foresee.
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The essential point is that all foreknowledge machines which are not in an interference viewing scenario will deliver identical viewer foreknowledge when applied to any given future outcome. This means that all parties who use foreknowledge machines will necessarily work together toward the same outcomes, as these outcomes have been optimized for the parties concerned by the complex quantum process which would make viewer foreknowledge possible. Referring to your last sentence above, one must remember the special case of non-interference which occurs when parties who know about a given future act to bring that very future about.
6) Even if a foreknowledge machine were possible, I would be very surprised if this was something we could develop in 20 or 30 years.
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Okay, you would be surprised. According to my knowledge of current technology (and even what was reported in journals twenty years ago), if foreknowledge machines are possible, I would be surprised if it takes our best and most open-minded engineers longer than that to figure out how to make them.
7) I agree that better predictive technology would be valuable. But machines that are occasionally wrong are still extremely useful if their error rates are low. We don't necessarily need theoretically perfect foresight.
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You may know this, but I have to respond in the following way every time someone describes foreknowledge machines as a predictive technology. Foreknowledge machines don't predict anything. One could base predictions on viewer foreknowledge and they would always be right (that is why they would be "predictively useful," to distinguish them from Everett machines which could not help us know anything about which future will come to pass), but foreknowledge machines themselves aren't involved in prediction at all.
I am now fully convinced that I need to emphasize this distinction much more clearly, since five or six other people have also arrived at the same (understandable) misconception (which I did not sufficiently guard against, as the possibility of confusion here had not occurred to me).
Now that that is out of the way, I think you may have been expressing that a future-viewing machine which sometimes delivers a view of the future that is wrong would still be useful. However, when would we trust it and when would we assume that it could be wrong? A predictive technology that is sometimes wrong is fine--that's the nature of prediction--but a viewing technology cannot sometimes be wrong, and be useful. That would be like a telescope which sometimes shows Blackbeard and Captain Ahab walking on the deck of a distant ship, when only Blackbeard is on board. See what I mean?
I look forward your further thoughts. Your comments have been extremely valuable. Thank you once again, and I am keen to read your essay and continue our productive conversation on the work we are both doing to help our fellow humans and the future of our planet.
Warm regards,
Aaron