Math Forum http://mathforum.org/kb List of forum topics en wikipedia.org/wiki/Quantifier#Equivalent_Expressions http://mathforum.org/kb/thread.jspa?messageID=7924866&tstart=0#7924866 Nov 17, 2012 9:30:26 PM Nov 17, 2012 9:30:26 PM infinity@limited.com 0