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."
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.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 113.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
IMPORTANT -- From the end of chapter 113: