Dr. J.K. Thukral is an Associate Professor, Department of Mathematics, Shri Ram College of Commerce, University of Delhi. Dr. Thukral received his Doctorate degree in Mathematics from the University of Delhi in 1987. In 1989, he was awarded the National Scholarship for his Post-Doctoral studies and research at the Michigan State University, USA. He has made valuable contribution to research in Operator Theory and Functional Analysis and has a number of publications to his credit in National and International journals.     Dr. Thukral is also associated with Post-graduate teaching in the Department of Mathematics, University of Delhi. Dr. Thukral is the author of several mathematics text books, among which is an advanced level book: Mathematics for Business Studies, published by Mayur Paper-backs (Paperback division of National Publishing House).