Larks comments on But Somebody Would Have Noticed - Less Wrong

36 Post author: Alicorn 04 May 2010 06:56PM

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Comment author: cousin_it 05 May 2010 07:38:38PM *  0 points [-]

Suppose we decide to specify that R(R) is true. Then, by your definition not(R(R)) is true.

No, in this case R(X) = not(X(X)) for all X distinct from R, and additionally R(R) is true. This is a perfectly fine, completely defined, non-self-contradictory predicate.

Comment author: Larks 13 May 2010 09:30:27AM 1 point [-]

Why is R(X) = not(X(X)) only for R =/= X? In Russell's version, X should vary over all predicates/sets, meaning when instance X with R, we get

R(R) = ¬R(R)

as per the paradox.