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Acknowledgments

I am grateful to Dr. Anil Bhowmick for his continued encouragement and support.

I thank Dr. Ananda Datta, Venki Krishnamoorthy, and Satish Badgi for their con­

structive comments and suggestions.

I want to recognize my daughters—​Aparajita for the illustration in Chapter 10 and

Amrapali for reviewing the initial chapters.

I appreciate my son-​in-​law Lahiru for the infinite snacks and granddaughter Anika for

her inspiring smiles.

For editing my manuscript and keeping my dream alive—​I thank my wife Saswati.