File talk:Poset6.jpg

Very nice picture, well done. Just want to mention: Isn't the notation {o} of the empty set incorrect and the correct one would be to use only the striked out o without the curly braces? [[1]] Methossant (talk) 16:55, 26 January 2008 (UTC)[reply]

Yes, that is correct. {∅} is a (nonempty) set containing the empty set. -- Borb (talk) 14:33, 26 March 2011 (UTC)[reply]