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Prefaces to the German Editions
wife, Claudia, without whose often tried patience this book could not
have been written.
Preface to the Second German Edition
The pleasant circumstance that this book's first edition sold out in
only two years gives me the opportunity to expand the bibliography
and to correct some errors spotted by several alert readers, partic-
ularly Daniel Adler, Ulrich Brosa, Kurt Ewald, Volker Kern, Ralf
Krawczyk, and Heinz Liineburg.
Preface to the Third German Edition
I again have alert readers to thank for the discovery of errors: Er-
win Hartmann, Alfred Moser, and David Kramer, who is also the
translator of the English-language edition. Finally, I have fulfilled
my frequently mentioned desire to provide the book with a set of
exercises for the reader.
The Author's Coordinates. Readers are encouraged to report er-
rors or infelicities via e-mail to mail@bewersdorff-online. de. Ques-
tions will also be answered to the extent possible. Additions and cor-
rections will be published on my website: http : //www. bewersdorff-
online.de. The AMS will also maintain a web page for this book.
The URL can be found on the back cover.
Jorg Bewersdorff
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