Xuran Wang graduated from Columbia University with a Bachelor in Mathematics and a Bachelor in Economics in spring 2010 as a Rabi Science Scholar. This research paper is completed in the summer of 2009 as part of the Summer Undergraduate Research Program funded by the mathematics department at Columbia under the guidance of Professor Robert Lipshitz and Professor Tim Perutz.

Faculty Sponsor: Robert Lipshitz, Department of Mathematics, Columbia University
lipshitz@math.columbia.edu