S. S. SASTRY, Ph.D., is Formerly, Scientist/Engineer SF in the Applied Mathematics Division of Vikram Sarabhai Space Centre, Trivandrum. Earlier, he taught both undergraduate and postgraduate students of engineering at Birla Institute of Technology, Ranchi. A renowned mathematical scientist and the author of the books Engineering Mathematics, Advanced Engineering Mathematics, and several other books on Engineering Mathematics (all published by PHI Learning), Dr. Sastry has a number of research publications in numerous journals of national and international repute.