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Mathematics Colloquium EVENT DETAIL Date:  Thursday, May 07, 2009 Title:  What we know and don't know about 4-dimensions (Note the special day and time) Abstract:  This talk is for those who know nothing about 4 dimensional spaces, but hope to learn where the boundary lies between ignorance and knowledge. As I hope to explain, the boundary is quite sharp and easy to see. Speaker:  Cliff Taubes Institution:  Harvard Univsersity   Back to current Colloquium List Back to UM Math seminars page .