Re: set of a set etc.




Le 19/07/05 17:07, dans
1121785635.289753.286110@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, « Jasper »
<vfiddlestix@xxxxxxx> a écrit :

> Actually I was wondering about the conceptual changes between different
> levels of "setting".
> Some things that might help would be {{x}} - {x} for example. This must
> have been discussed in the literature somewhere.

Not much more than what you can imagine with "bags".
{{x}} - {x} = {{x}}, because x doesn't belong to {{x}}.

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