Our original reason for writing this book was the desire to write down in one place a complete summary of the major results in du ality theory pioneered by Rona

Jex thought she was an average, post-college girl--until she crippled a drunk and nearly incinerated a gas station. When her elemental powers manifest, she's to

Grothendieck's duality theory for coherent cohomology is a fundamental tool in algebraic geometry and number theory, in areas ranging from the moduli of curves

This book deals with the theory of Kac algebras and their dual ity, elaborated independently by M. Enock and J . -M. Schwartz, and by G. !. Kac and L. !. Vajner