### About this book

Variational arguments are classical techniques whose use can be traced
back to the early development of the calculus of variations and
further. Rooted in the physical principle of least action, they have
wide applications in diverse fields. This book provides a concise
account of the essential tools of infinite-dimensional first-order
variational analysis. These tools are illustrated by applications in
many different parts of analysis, optimization and approximation,
dynamical systems, mathematical economics and elsewhere. Much of the
material in the book grows out of talks and short lecture series given
by the authors in the past several years. Thus, chapters in this book
can easily be arranged to form material for a graduate level topics
course. A sizeable collection of suitable exercises is provided for
this purpose. In addition, this book is also a useful reference for
researchers who use variational techniques - or just think they might
like to.
Written for:

Graduate students, pure and applied mathematicians, lecturers, researchers