Cyclotomic fields have always occupied a central place in number theory,
and the so called "main conjecture" on cyclotomic fields is arguably the
deepest and most beautiful theorem known about them. It is also the
simplest example of a vast array of subsequent, unproven "main
conjectures'' in modern arithmetic geometry involving the arithmetic
behaviour of motives over p-adic Lie extensions of number fields. These
main conjectures are concerned with what one might loosely call the
exact formulae of number theory which conjecturally link the special
values of zeta and L-functions to purely arithmetic expressions.
Written by two leading workers in the field, this short and 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. The masterly exposition is intended to be accessible to
both graduate students and non-experts in Iwasawa theory.