Preface IX the idea s presented . Appendi x B provide s hint s fo r man y o f thes e exercises. The firs t autho r woul d lik e t o sincerel y than k Serge i Tabach - nikov, Directo r o f the MAS S program a t Pen n State , fo r invitin g hi m to teac h a cours e i n the MAS S program . Bot h author s woul d lik e t o thank Serge i fo r hi s encouragemen t t o conver t ou r initia l clas s note s into thi s text . Th e firs t autho r use d thi s tex t i n hi s MAS S clas s taught durin g th e Fal l semeste r o f 2006 . W e would lik e t o sincerel y thank Charle s F . La y win e fo r hi s carefu l readin g an d man y excellen t suggestions whic h greatl y improve d th e readabilit y o f ou r book . A special wor d o f thank s i s owe d t o th e 200 6 clas s o f MAS S students , who provide d numerou s comment s an d helpfu l suggestion s fo r im - provements i n additio n t o locatin g a number o f typographical errors . We als o than k th e publishin g staf f o f th e America n Mathematica l Society wh o helpe d brin g thi s boo k t o a successful conclusion . G. L . Mulle n C. Mummer t

Purchased from American Mathematical Society for the exclusive use of nofirst nolast (email unknown) Copyright 2007 American Mathematical Society. Duplication prohibited. Please report unauthorized use to cust-serv@ams.org. Thank You! Your purchase supports the AMS' mission, programs, and services for the mathematical community.