Unnamed comments on Harry Potter and the Methods of Rationality discussion thread, part 17, chapter 86 - Less Wrong Discussion
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Comments (606)
Svsgl-sbhe.
Makes sense. Six possible one-directional (A loves B, B loves A, etc) relationships that can be either present or not, so 2^6 = 64. Each person has 3 graphs where they're disconnected but the others are not (A loves B, B loves A, A and B love each other), and one where there are no connections at all. 64 - 3*3 - 1 = 54.
There's thirteen kinds of Triang Relations (warning: TV Tropes), but that counts, for example, both love Draco the same as both love Harry.
4, actually, since "nobody loved draco and draco loved nobody", we're left with Hermione and Harry, which leaves a mere two one-directional options. 2^2=4.
"Draco loves nobody and nobody loves Draco" isn't a given, it's a subset of possible "love triangle" conditions which can be ruled out on the basis of their invalidating the love triangle premise. Configurations in which either Harry or Hermione neither love nor are loved by anyone would also be excluded.