AoPSWiki Article of the Day
Set was the AoPSWiki Article of the Day for November 25th, 2007

This article could use an introductory level definition, along with the definition of elements of a set, and how to count them.--MCrawford 02:55, 5 August 2006 (EDT)

I don't think that's a very good explanation of why the power set has the size it does -- there is a much more direct counting argument to arrive at that result, and as currently presented it's totally unclear what that sum has to do with anything. Also, I think that explanation would be better in the article on power set rather than here. --JBL 14:10, 12 November 2006 (EST)