This book presents in a short volume the basics of quantum field
theory and many body physics. The first part introduces the
perturbative techniques without sophisticated apparatus and applies
them to numerous problems including quantum electrodynamics
(renormalization), Fermi and Bose gases, the Brueckner theory of
nuclear system, liquid Helium and classical systems with noise. The
material is clear, illustrative and the important points are
stressed to help the reader get the understanding of what is
crucial without overwhelming him with unnecessary detours or
comments. The material in the second part ranges from variational
principles to path integrals, discusses gauge theory, the
renormalization group and classical solutions together with their
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