Re: Is {{}} a valid construct?

From: Marshall <marshall.spight_at_gmail.com>
Date: 2 Feb 2007 23:58:12 -0800
Message-ID: <1170489492.230757.104470_at_s48g2000cws.googlegroups.com>


On Feb 2, 9:54 pm, "Neo" <neo55..._at_hotmail.com> wrote:

>

> According to my understanding, it seems {} and {{}} are invalid
> constructs. How can I empirically verify they are valid?

Empirical verification:

http://en.wikipedia.org/wiki/Axiom_of_empty_set

Marshall Received on Sat Feb 03 2007 - 08:58:12 CET

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