Written by two leading workers in the field, this brief but elegant book
presents in full detail the simplest proof of the "main conjecture" for
cyclotomic fields. Its motivation stems not only from the inherent
beauty of the subject, but also from the wider arithmetic interest of
these questions.
From the reviews: "The text is written in a clear and attractive style,
with enough explanation helping the reader orientate in the midst of
technical details." --ZENTRALBLATT MATH