[FOM] consistency of NF?
tf at maths.cam.ac.uk
tf at maths.cam.ac.uk
Fri Jul 4 05:21:02 EDT 2014
On Jul 3 2014, Cody Roux wrote:
>Just to be clear, with respect to what are they showing consistency of NF?
At this stage, it's ZF, but it's a pretty safe bet that, when the smoke
and dust have cleared, we should be able to do it relative to Zermelo set
theory. (That's Holmes' proof i have in mind, but i think the two proofs
are very closely related. Ask me in october after i have spent 6 weeks in
conclave with Holmes going over both proofs)
>What is the strongest system known to be consistent conditional on
>consistency of NF?
Roland Hinnion wrote a thesis about this in the 1970's, and there is a
translation of it linked from my home page. The answer - at this stage - is
MacLane set theory (with infinity) Hinnion calls this theory Z\Delta_0
F\Delta_0 os something like that, but it's nowadays just called Mac.
tf
www.dpmms.cam.ac.uk/~tf
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