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Topic: Just another exposition of MK.
Replies: 10   Last Post: Mar 17, 2013 1:50 PM

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Posts: 2,665
Registered: 6/29/07
Re: Just another exposition of MK.
Posted: Mar 16, 2013 4:29 AM
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On Mar 16, 9:33 am, Zuhair <zaljo...@gmail.com> wrote:
> Define: Set(x) iff {x,..}
> Extensionality: x C y & y C x -> x=y
> Comprehension: {x| Set(x) & phi}
> Pairing: x C {a,b} -> Set(x)
> Generation: Set(x) & y C H(x) -> Set(y)
> where H(x)={z| m in TC({z}). |m| =< |x|}
> Size: |x| < |V| -> Set(U(x))
> where TC, U stand for transitive closure, union respectively defined
> in the customary manner; C is subclass relation; | | =< | | and | | <
> | | relations are defined in the standard manner.
> The theory above minus axiom of Size is sufficient to prove
> consistency of Z. With the axiom of Size it can prove the consistency
> of ZF+Global choice, and it is equi-interpretable with MK+Global
> choice.
> Zuhair

Of course V is the class of all sets

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