Yasumasa Canada ( Japanese 金田 康 正 Canada Yasumasa , born April 18, 1949 , Himeji ) is a Japanese mathematician [1] [2] .
| Yasumasa Canada | |
|---|---|
| Date of Birth | April 18, 1949 (70 years old) |
| Place of Birth | |
| A country | |
| Scientific field | Mathematics , Computer Science |
| Place of work | |
| Alma mater | |
| Academic rank | Professor |
| Website | |
Yasumasa Canada became known in the scientific community for his work on calculating the number pi (its value after the decimal point). Since 1997, he is a professor of computer science at the University of Tokyo .
Calculation of the number π
To this day, Yasumase Canada holds a record for calculating the value of pi. Thus, the Hitachi SR 8000 / MPP supercomputer calculated 1.2411 trillion decimal places, but these data were classified [3] . Computer computing speed is 2 trillion operations per second , and RAM is 1 terabyte [4] . These calculations took place on December 6, 2002 and lasted more than 400 hours [5] . The calculations were carried out according to the formulas of Machin, but other algorithms were also used: Brent – Salamina, Borvein et al. [4] In 1995, a special Bailey – Borvein – Plauff formula was created [4] :
Earlier, in 1981 , Yasumasa subtracted the value of pi to two million decimal places [6] . In 1995 , 6 billion characters were known [4] . By 1997, he could calculate 51 539 600 000 decimal places [7] . In 1999 - 206 158 430 000 characters [4] .
Notes
- ↑ Aurika Lukovkina. The latest crossword puzzle dictionary. - 2018.
- ↑ Vitaliy Zemlyak. The most complete crossword puzzle encyclopedia. - Litres, 2017 .-- S. 539. - ISBN 5457389618 . - ISBN 9785457389618 .
- ↑ News, AUM . Is the Pi number reasonable? (Russian) , AUM News . Date of appeal September 29, 2018.
- ↑ 1 2 3 4 5 Sergey Shumikhin, Alexander Shumikhin. Pi. History of 4000 Years / Ed. V. Obrucheva; thin ed. A. Durasov. - Moscow: Eksmo, 2011 .-- S. 57 .-- 197 p. - ISBN 5457404196 . - ISBN 9785457404199 .
- ↑ Natalya Olshevskaya. Big book of numerology.
- ↑ Simon Singh. The Simpsons and their mathematical secrets. - Moscow: Mann, Ivanov and Ferber, 2016 .-- S. 163. - 268 p.
- ↑ Science and Life, Issue 9-12 / All-Union Society "Knowledge." - True, 1997 .-- S. 23.