earthwormchuck163 comments on Second-Order Logic: The Controversy - LessWrong

24 Post author: Eliezer_Yudkowsky 04 January 2013 07:51PM

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Comment author: earthwormchuck163 05 January 2013 09:23:55AM 3 points [-]

I don't think ZFC can prove the consistency of ZF either, but I'm not a set theorist.

Also not a set theorist, but I'm pretty sure this is correct. ZF+Con(ZF) proves Con(ZFC) (see http://en.wikipedia.org/wiki/Constructible_universe), so if ZFC could prove Con(ZF) then it would also prove Con(ZFC).