This volume began as the last part of a one-term graduate course given at the Fields Institute for Research in the Mathematical Sciences in the Autumn of 1993.

The book focuses on the relation between transformation groups and algebraic K-theory. The general pattern is to assign to a geometric problem an invariant in a

Hopf algebras have been shown to play a natural role in studying questions of integral module structure in extensions of local or global fields. This book surve