Acknowledgements

I would like to thank my Institute, Indian Institute of Technology (IIT), Delhi for granting me the sabbatical leave to start this project and providing the right stimulating environment to complete writing the book in time. I would also thank my faculty colleagues and the graduate students.

I would like to thank my Publisher, Tata McGraw-Hill for excellent editing and good interaction while compiling the final draft of the Book.

Foremost, I would like to thank my family for their patience, understanding and for their support.

Finally, I thank the Almighty God for giving me the strength to embark upon this project and with His blessings conclude it satisfactorily.

DEVI CHADHA

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