This book presents a variety of techniques for tackling phenomena that
are not amenable to the conventional approach based on the concept of
probabilities. The methods described rely on the use of path
integration, thermal Green functions, time-temperature propagators,
Liouville operators, second quantization, and field correlators at
finite density and temperature. Also exploring the statistical mechanics
of unstable quantum systems, the book is intended as a supplementary or
reference text for use in one-semester graduate courses on Quantum
Mechanics, Thermodynamics, Electromagnetism, and Mathematical Methods in
Physics.