From the reviews:
"This book is based on a course given by Professor Basdevant at the Ecole Polytechnique, near Paris. it would be an excellent basis for a course, provided one has the right collection of undergraduates. The book could also be used at a more advanced level in many ways . For anyone with radical tendencies in this direction, Basdevants book will provide an elegant launching point." (L. S. Schulman, SIAM Review, Vol. 49 (4), 2007)
"It invites the reader onto the vessel variational principles to embark on a journey through a variety of different areas and regions of physics. In general independent of individual preferences, Basdevants book provides a well-balanced overview of various old and new areas of theoretical physics based on an approach by variational principles. Not only will students profit from this book, but also more advanced readers might get captivated by it." (H. Hogreve, Mathematical Reviews, Issue 2009 f)
