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Oscar_Cunningham comments on Conservation of Expected Evidence - Less Wrong
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Comments (76)
Eliezer, isn't the "equal" part untrue? I like the parallel with Newton's 3rd law, but the two terms P(H|E)*P(E) and P(H|~E)*P(~E) aren't numerically equal - we only know that they sum to P(H).
The changes are equal and opposite:
[ P(H|E) - P(H) ]*P(E) + [ P(H|~E) - P(H) ]*P(~E) = 0
See Nick Hay's much earlier comment.