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\textsc{Colloquium}
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\textit{Lattice polygons and the number 12}
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Bjorn Poonen\par
UC Berkeley
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\textbf{Abstract:} Let $P$ be a convex lattice polygon with one interior lattice point.  The number of lattice points on the boundary of $P$ plus the corresponding number for the dual polygon (to be defined) always equals 12.  We will sketch four different proofs of this result, and explain why this 12 is the same as the 12 that arises in various other branches of mathematics.\vspace{\fill}
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Tuesday, March 25, 2008, 4:00 pm\par
Mathematics and Science Center: W201
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Refreshments will be served in the department lounge at 3:30PM
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\textsc{Mathematics and Computer Science}\par
\textsc{Emory University}
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