ikacer comments on Harry Potter and the Methods of Rationality discussion thread, part 19, chapter 88-89 - Less Wrong
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In HPMOR, time travel obeys the Novikov self-consistency principle (with the exception of liberal use of deus ex machina to keep it from being over-powered). If it were possible for Harry to use a time-turner to save Hermione, she wouldn't have died in the first place.