Re: Is {{}} a valid construct?

From: Neo <neo55592_at_hotmail.com>
Date: 4 Feb 2007 20:21:30 -0800
Message-ID: <1170649290.515239.130210_at_v33g2000cwv.googlegroups.com>

> [Heavy] Sigh, I know I waste my breath but here goes: The empty set is the canonical (and only) set of cardinality zero: {}. The set containing only the empty set is the canonical (but not the only) set of cardinality one: {{}}

Suppose the universal set is { {}, {{}} } What is NOT {}? Received on Mon Feb 05 2007 - 05:21:30 CET

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