On Wed, May 9, 2012 at 12:48 PM, Bruno Marchal <marc...@ulb.ac.be> wrote:

> The empty set is the absence of elements (nothing) in that set. It is the
> set { }.
> The empty set is not nothing. For example, the set is { { } } is not
> empty. It contains as element the empty set.
> Just to be precise.

Well, I guess that the empty set is more like an empty box.


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