Rationality Quotes April 2012

Oscar_Cunningham

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Here's the new thread for posting quotes, with the usual rules:

Please post all quotes separately, so that they can be voted up/down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
Do not quote yourself
Do not quote comments/posts on LW/OB
No more than 5 quotes per person per monthly thread, please.

Wow. That's really cool, thank you. Upvoted you, jeremysalwen and Nornagest. :)

Could you also explain why the HPMoR universe isn't Turing computable? The time-travel involved seems simple enough to me.

Not a complete answer, but here's commentary from a ffdn review of Chapter 14:

Kevin S. Van Horn
7/24/10 . chapter 14
Harry is jumping to conclusions when he tells McGonagall that the Time-Turner isn't even Turing computable. Time travel simulation is simply a matter of solving fixed-point equation f(x) = x. Here x is the information sent back in time, and f is a function that maps the information received from the future to the information that gets sent back in time. If a solution exists at all, you can find it to any desired degree of accuracy by simply

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