Congratulations to Professor Richeson for his recent publication. See link attached.
http://www.ams.org/journals/proc/2010-138-12/S0002-9939-2010-10434-3/home.html
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http://www.facebook.com/pages/Carlisle-PA/Dickinson-College-Department-of-Mathematics-and-Computer-Science/68252818085?v=photos#!/pages/Carlisle-PA/Dickinson-College-Department-of-Mathematics-and-Computer-Science/68252818085?v=wall