Re: Ordnung (Kamke)

On Mon, 6 Aug 2007 23:41:25 +0200, Peter Niessen
<peter-niessen@xxxxxxxx> wrote:


Nicht umsonst bezeichnet auch Zermelo die leere Menge als uneigentliche
Menge.

Das hat nicht zuletzt auch historische Gründe (aber offenbar nicht
nur).

Siehe:

Akihiro Kanamori, The Empty Set, the Singleton, and the Ordered Pair
www.math.ucla.edu/~asl/bsl/0903/0903-001.ps


K. H.

--

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