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Math Forum » Discussions » sci.math.* » sci.math.independent

Topic: What are sets? again
Replies: 21   Last Post: Dec 9, 2012 10:12 AM

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Graham Cooper

Posts: 4,040
Registered: 5/20/10
Re: What are sets? again
Posted: Dec 3, 2012 1:40 AM
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On Dec 3, 5:28 am, Charlie-Boo <shymath...@gmail.com> wrote:
>
> All you need to do is to say that every FOL wff with a free variable
> defines a set

But you need some extra syntax to specify which variable.


mod( mult( 2, X ) , 5 )

/\
||
\/

{ X | mod( mult( 2, X ) , 5 ) }


then you are back at Naive Set Theory.

Which is ok if you have some extra definitions to ensure some
consistency.

Herc

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