British mathematician. 1812 65438+10 was born in cosense, Northumberland on 25th October, and 1882 died in Horton-Replin, Durham.

Yonkers's role in the history of science is quite peculiar. He has run a boarding school for a year. In my spare time, I am keen on difficult and boring calculations, especially π calculations. This is a circle and its diameter ratio is about 3 and 1/7. The value of π cannot be accurately expressed in decimal, because it is a finite acyclic decimal. Its first few digits are 3. 14 159.

You can use a Yu expression to calculate the value of π to 707 bits, and it will not end until 1873. As far as the actual situation is concerned, although Janks has been engaged in this work for most of his life, it does not have much significance in pure mathematics and applied mathematics. In the next 70 years, no one else sought more accurate results, so his work was often mentioned in footnotes of works on the history of science.