The ideas here have developed over the years thanks to so many people who wrote articles, books and discussed challenging problems that have remained unsolved for long.
The free and open source movement made it easy to share and develop code across the globe and I am obliged to one and all who have contributed to usable software, especially bc math, x3d and related tools that make this site possible. A special thanks to https://www.wolframalpha.com/ that aids considerably in calculating and computing with large numbers, values and functions through their online tools.
My extended family of relatives and friends shared many inputs. I am especially thankful and grateful to my wife Bhuvana for her support and patience, my daughter Nirrenjana for verifying and checking my writing, my niece Prani for the creative drawings in the articles, and friends for their invaluable feedback and correspondence.
K. Ramanraj, 15th July, 2020.