I feel great pleasure in bringing out the first edition of the book. "An Introduction to Fluid Dynamics", this book has been written especially in accordance with the latest and modified syllabus framed for Undergraduate and Postgraduate students. A reasonably wide coverage in sufficient depth has been attempted. The book contains sufficient number of problems. We hope that if a student goes through with all these, he or she would appreciate and enjoy the subject.

The publication of the rst edition of the book "Lagrangian and Hamiltonian Dynamics" gives me tremendous joy. This book was specically developed to adhere to the most recent and changed syllabus created for UG and PG students. An adequate depth of coverage with a respectable breadth has been attempted. A signicant number of problems are present in the book. If a student follows through with all of these, we hope that he or she will understand and like the topic.