This book very interesting is not limited only to variational principles of mechanics but offers a clear and accessible presentation from the Lagrangian formalism to the equation of Hamilton-Jacobi. Each concept is on display with care in order to help the reader to assimilate the physical ideas behind the different concepts. A summary of the main results is proposed in a box at the end of each part. This book will provide a good complement its original vision to more classic, like Goldstein or Landau. For anyone wishing to better understand the subject.
