Preface xi

a broad range of topics en route—is a good way to help advanced un-

dergraduates integrate what they have learned and prepare for their

careers. Whether or not they pursue graduate studies in the particu-

lar focus areas seems secondary to me, even though I am quite fond

of the subject area of this book.

Turning the lectures into a book introduced another set of chal-

lenges. Undergraduate students reading this book will probably not

have the beneﬁt of lectures at which they can ask questions as they

go along. In addition, the PCMI students were helped by an expert

teaching assistant, Artur Elezi. Since I assume that the reader will

not have direct access to a faculty member, I have added much back-

ground material that was left out of the lectures, while trying to keep

the informal feel throughout. I added material on diﬀerential geome-

try which was not needed in the original lectures since this topic was

covered in Ruth Gornet’s lectures. Even so, the reader is warned that

this book is not self-contained. In particular, working through this

book is not a substitute for a more thorough and more pedagogical

treatment of any of the background topics reviewed here. I have cer-

tainly cut out much important foundational material to streamline

the process of getting to the desired results. Even worse, sometimes

for the sake of expediency I have given very nonstandard treatments

of subjects. Some of these have a somewhat clumsy feel to them. This

is especially true of the ad hoc treatment I have given of the beautiful

subject of algebraic geometry. An undergraduate student interested

in algebraic geometry reading this book is urged to consult the refer-

ences provided. A graduate student interested in algebraic geometry

reading this book is urged to provide the standard deﬁnitions of all of

the concepts which have been introduced here in an ad hoc fashion.

Each of the chapters of the book corresponds reasonably closely

to one of the lectures, the exception being that the material from a lec-

ture entitled “More on bundles” has been divided up and distributed

through other chapters, so that there are only fourteen chapters re-

placing ﬁfteen lectures. Since material has been added beyond the

content of the original lectures, each chapter contains substantially

more than one lecture’s worth of material.

a broad range of topics en route—is a good way to help advanced un-

dergraduates integrate what they have learned and prepare for their

careers. Whether or not they pursue graduate studies in the particu-

lar focus areas seems secondary to me, even though I am quite fond

of the subject area of this book.

Turning the lectures into a book introduced another set of chal-

lenges. Undergraduate students reading this book will probably not

have the beneﬁt of lectures at which they can ask questions as they

go along. In addition, the PCMI students were helped by an expert

teaching assistant, Artur Elezi. Since I assume that the reader will

not have direct access to a faculty member, I have added much back-

ground material that was left out of the lectures, while trying to keep

the informal feel throughout. I added material on diﬀerential geome-

try which was not needed in the original lectures since this topic was

covered in Ruth Gornet’s lectures. Even so, the reader is warned that

this book is not self-contained. In particular, working through this

book is not a substitute for a more thorough and more pedagogical

treatment of any of the background topics reviewed here. I have cer-

tainly cut out much important foundational material to streamline

the process of getting to the desired results. Even worse, sometimes

for the sake of expediency I have given very nonstandard treatments

of subjects. Some of these have a somewhat clumsy feel to them. This

is especially true of the ad hoc treatment I have given of the beautiful

subject of algebraic geometry. An undergraduate student interested

in algebraic geometry reading this book is urged to consult the refer-

ences provided. A graduate student interested in algebraic geometry

reading this book is urged to provide the standard deﬁnitions of all of

the concepts which have been introduced here in an ad hoc fashion.

Each of the chapters of the book corresponds reasonably closely

to one of the lectures, the exception being that the material from a lec-

ture entitled “More on bundles” has been divided up and distributed

through other chapters, so that there are only fourteen chapters re-

placing ﬁfteen lectures. Since material has been added beyond the

content of the original lectures, each chapter contains substantially

more than one lecture’s worth of material.