Re: set of a set etc.
- From: Jean-Claude Arbaut <jean-claude.arbaut@xxxxxxxxxxx>
- Date: Tue, 19 Jul 2005 16:58:33 +0200
Le 19/07/05 16:55, dans
1121784928.706774.277810@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, « Jasper »
<vfiddlestix@xxxxxxx> a écrit :
> What is the difference between x, {x}, {{x}}, {{{x}}} etc?
> Especially for x=null set?
>
x is an empty set, it contains nothing.
{x} is a non empty set, it contains a set, which is the empty set.
etc.
.
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