Checking answers
Mathematics I do not know who to attribute all the various methods of doing mathematics which I am going to write on from today. One of the earliest books to be written about these methods was written by Jakow Trachtenberg. He was a Russian who was born in 1888 and died in 1953.Subsequently many others have changed a little here and there and called it their own. All I can say is that I learnt all these as I was growing up and none of it is my own and now I share them with you.