This text explains the features of quantum and statistical field
systems that result from their field-theoretic nature and are
common to different physical contexts. It supplies the practical
tools for carrying out calculations and discusses the meaning of
the results. The central concept is that of effective action (or
free energy), and the main technical tool is the path integral,
although other formalisms are also mentioned. The author emphasizes
the simplest models first, then progresses to discussions of real
systems before addressing more general and rigorous conclusions.
The book is structured around carefully selected problems, which
are solved in detail.
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