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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 17, 2013 1:50 PM
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On Mar 17, 7:27 pm, Frederick Williams <>
> Zuhair wrote:

> > On Mar 16, 9:33 am, Zuhair <> wrote:
> > > Define: Set(x) iff {x,..}
> > Define: Set(X) iff {X,..} exists.
> Does this mean that X is a set iff it is an element of something?
> --
> When a true genius appears in the world, you may know him by
> this sign, that the dunces are all in confederacy against him.
> Jonathan Swift: Thoughts on Various Subjects, Moral and Diverting

Yes, all terms range over CLASSES. So the above means

Any class X is a set iff it is an element of some class.

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