Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

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

 Messages: [ Previous | Next ]
 William Elliot Posts: 2,637 Registered: 1/8/12
Re: What are sets? again
Posted: Dec 2, 2012 10:38 PM

On Sun, 2 Dec 2012, Zuhair wrote:
> On Dec 2, 10:44 am, William Elliot <ma...@panix.com> wrote:
> > On Sat, 1 Dec 2012, Zuhair wrote:

> > > > > The following is an account about what sets are,
> >
> > > > > Language: FOL + P, Rp
> > > > > P stands for "is part of"

> >
> > > > Does P represent "subset of" or "member of"?
> > > Neither.
> >
> > > P represents "is part of"
> > > review mereology to understand that relation informally.

> > What is simple jargon, a brief intuitive description of "is a part of".

> Just read Varzi's article on Mereology:
> http://plato.stanford.edu/entries/mereology/

It's long winded as philosophy usually is.
Basically, "is a part of" is a (partial) order.
"Subset" is the better interpretation that "is member of".

So I'll take it as "subset" unless you give a useful
interpretation within 300 words or less.

> The relation "is part of" is well understood philosophically speaking,
> it has natural examples.

For example?

> I think Varzi's account on it is nice and interesting really. You can
> also read David Lewis account on it. The discipline of Mereology is
> well established.

What's the point of mereology?

Date Subject Author
11/30/12 Zaljohar@gmail.com
12/1/12 William Elliot
12/1/12 Zaljohar@gmail.com
12/2/12 William Elliot
12/2/12 Graham Cooper
12/2/12 Zaljohar@gmail.com
12/2/12 William Elliot
12/2/12 ross.finlayson@gmail.com
12/3/12 William Elliot
12/4/12 fom
12/9/12 Charlie-Boo
12/4/12 fom
12/2/12 Charlie-Boo
12/3/12 Graham Cooper
12/3/12 William Elliot
12/4/12 fom
12/4/12 Zaljohar@gmail.com
12/5/12 fom
12/5/12 Zaljohar@gmail.com
12/4/12 Zaljohar@gmail.com
12/5/12 Zaljohar@gmail.com
12/5/12 Zaljohar@gmail.com