By introducing a new stabilization methodology, this book characterizes
the stability of a certain class of systems. The stability (exponential,
polynomial, or weaker) for the closed loop problem is reduced to an
observability estimate for the corresponding uncontrolled system
combined with a boundedness property of the transfer function of the
associated open loop system. A similar strategy is applied to systems
where a delay term is added. The book concludes with many concrete
examples. This book is addressed to graduate students in mathematics or
engineering and also to researchers with an interest in stabilization
and control systems governed by partial differential equations.