The book offers a direct and up-to-date introduction to the theory of
one-parameter semigroups of linear operators on Banach spaces. It
contains the fundamental results of the theory such as the Hille-Yoshida
generation theorem, the bounded perturbation theorem, and the
Trotter-Kato approximation theorem. It also treats the spectral theory
of semigroups and its consequences for the qualitative behavior. The
book is intended for students and researchers who want to become
acquainted with the concept of semigroups in order to work with it in
fields like partial and functional differential equations, stochastic
processes, infinite dimensional control theory, or dynamical systems
coming from physics or biology. Exercises are provided at the end of the
chapters.