<div dir="auto">Terry Pratchett, one of my favourite authors all time, hypothesed that you walk through life backwards since you can see the past but not the future. <div dir="auto">/Henrik</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Den lör 4 jan. 2020 16:18John Clark via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> skrev:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><font size="4">You don't have to invoke Quantum Mechanics or Relativity to figure out there are some funny things about time. In our world we, perhaps naively, believe the past exists and is knowable but the future doesn't exist in the same concrete way and we can only speculate what it will be like, but that may not be true everywhere. Conway's Game of Life has just a few very simple rules that are 100% deterministic, so given the current state it's easy to figure out what the next generation will be, and the generation after that and so on for as far into the future as you'd like, however it is not reversible. Given the present state there is no way to know what the previous state was, you can rule out some states but because more than one state could have produced the present one there is no way to know which one actually did.</font><div><font size="4"><br></font></div><div><font size="4">We also know that although ridiculously simple it's more than just a toy universe because the fundamental laws of physics in Conway's universe allow for the construction of a Universal Turing Machine; so at least in theory a AI could exist that lived entirely in Conways world and operated according to his simplified physics. To such a being the future would be certain and hold no mystery but the past could only be speculated about. To such a being would the arrow of time point in the opposite direction from the way we see it? I can't see why it wouldn't.</font><div><br></div><div><font size="4">John K Clark</font></div></div></div>
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