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This book offers an elementary and unified introduction to the
non-perturbative results obtained in relativistic quantum field
theory based on classical soliton and instanton solutions. Such
solutions are derived for a variety of models and classified by
topological indices. The methods are then developed for quantizing
solitons to obtain quantum particles. Vacuum tunneling,
&ugr;-vacua and the dilute-instanton-gas approximation are
described in detail. Other instanton effects related to quark-quark
forces, confinement, the U(1) problem and Borel summability are
also discussed. The emphasis is on presenting the basic ideas in a
simple pedagogical way. Technical tools like functional methods,
Grassman integrals, homotopy classification, collective
co-ordinates etc. are developed ab initio.
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