ForewordScienceiswhatweunderstandwellenoughtoexplaintoacomputer.Artiseverythingelsewedo.DuringthepastseveralyearsanimportantpartofmathematicshasbeentransformedfromanArttoaScience:Nolongerdoweneedtogetabrilliantinsightinordertoevaluatesumsofbinomialcoe?cients,andmanysimilarf