Quantum Field Theory D 79111 Freiburg This book includes both theoreti Pathologisches Institut der Universität This book includes both theoreti cal foundations and practical approaches for each topic This book constitutes the refereed proceedings of the 7th International Conference on High Performance Computing and Networking a strong case can be made that quantum field theory is the mathematical and intellectual framework for describing and understanding all physical phenomena The concept of the renormalization group has given us a new perspective on field theory in general and on critical phenomena in particular