The authors report on recent progress by Musin, Cohn, and Elkies on optimal sphere packings, and review the background of a subject that touches many areas of mathematics. (pp. 873)
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Thomas Callaghan, Peter J. Mucha, and Mason A. Porter
The authors undertook a mathematical analysis of the system used to determine the finalists in the United States college football championship series. Here they compare the current system and possible alternatives. (pp. 887)
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