paper-machine comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapter 113 - Less Wrong

8 Post author: Gondolinian 28 February 2015 08:23PM

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Comment author: Gondolinian 01 March 2015 12:20:27AM *  8 points [-]

"All your servantss will die if they fire at me. They will die if you do not command them to sstand down NOW."

Comment author: [deleted] 01 March 2015 12:29:38AM 8 points [-]

I really like "Parseltongue 'if' is material implication", but if this were true I'd expect Voldy to know about it and request clarification, e.g.,

"Explain exactly how they will die, or I will shoot you in five seconds."

Comment author: Gondolinian 01 March 2015 12:39:11AM *  5 points [-]

"Explain exactly how they will die, or I will shoot you in five seconds."

"The world will end if I tell you!"

(admittedly non-optimal)

Comment author: dxu 01 March 2015 06:59:36AM *  3 points [-]

I'd expect Voldy to know about it and request clarification

Not necessarily. Parseltongue, if I understand it correctly, forces the speaker to tell the truth as he/she understands it (while bypassing Occlumency). If Harry knows about material implication (which he almost certainly does), he can utilize it in such a manner, but it's unlikely that Voldemort has ever encountered something similar. This isn't your standard clever wordplay that anyone smart can think of, after all--it's formal logic, which is decidedly Muggle.

Comment author: redlizard 03 March 2015 12:09:41AM 1 point [-]

So it's nonstandard clever wordplay. Voldemort will still anticipate a nontrivial probability of Harry managing undetected clever wordplay. Which means it only has a real chance of working when threatening something that Voldemort can't test immediately.

Comment author: dxu 03 March 2015 12:17:50AM 0 points [-]

Correct. I address this in another comment.