Thanks for the link, very nice. It also led me to Concrete Mathematics by Knuth, et al ... https://www.csie.ntu.edu.tw/~r97002/temp/Concrete%20Mathematics%202

Thanks for the link, very nice. It also led me to Concrete Mathematics by Knuth, et al ... https://www.csie.ntu.edu.tw/~r97002/temp/Concrete%20Mathematics%202e.pdf https://www.csie.ntu.edu.tw/~r97002/temp/Concrete%20Mathemat...