Yasumasa Kanada (金田 康正) is a Japanesemathematician most known for his numerous world records over the past two decades for calculating digits of π. This article is in need of attention from an expert on the subject. ... Lower-case pi Area of the circle = Ï€ × area of the shaded square The mathematical constant Ï€ is a real number which is defined as the ratio of a circles circumference (Greek πεÏιφÎÏεια, periphery) to its diameter in Euclidean geometry, and which is in common use in mathematics, physics, and engineering. ...
Kanada is a professor in the Department of Information Science at the University of Tokyo in Tokyo, Japan. The University of Tokyo (æ±äº¬å¤§å¦; TÅkyÅ Daigaku, abbreviated as æ±å¤§ TÅdai) is generally ranked as Japans most prestigious university, as well as a leading university in Asia. ... Headquarters of Tokyo Metropolitan Government View of Tokyos Shibuya district Tokyo ) (help· info), literally eastern capital, is one of the 47 prefectures of Japan and includes the highly urbanized downtown area formerly known as the city of Tokyo which is the heart of the Greater Tokyo Area. ...
As of 2003, Kanada held the world record calculating the number of digits in the decimal expansion of pi – exactly 1.2411 trillion digits. The calculation took more than 600 hours on the supercomputer, 64 nodes of HITACHI SR8000/MPP. Some of his competitors in recent years include Jonathan and Peter Borwein and the Chudnovsky brothers. 2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ... A supercomputer is a computer that leads the world in terms of processing capacity, particularly speed of calculation, at the time of its introduction. ... Jonathan M. Borwein (born 1951) was Shrum Professor of Science (1993-2003) and a Canada Research Chair in Information Technology (2001-08) at Simon Fraser University, and was founding Director of the Centre for Experimental and Constructive Mathematics. ... Peter B. Borwein is a Canadian mathematician, co-developer of an algorithm for calculating Ï€ to the nth digit, co-discoverer of the billionth, four billionth, 40th billionth, and quadrillionth digits of Ï€, and professor at Simon Fraser University. ... The Chudnovsky Brothers are mathematicians known for their wide-ranging mathematical abilities, their home-built supercomputers, and their close working relationship. ...
Computer scientist YasumasaKanada and his coworkers at the University of Tokyo Information Technology Center have now succeeded in computing 1,241,100,000,000 decimal digits of pi, smashing their own previous world record of 206,158,430,000 digits, set in 1999.
Kanada estimates that if the new version of the algorithm had been applied in 1999 to compute 206 billion digits of pi, the total calculation time on the same computer would have been cut from 83 to 38 hours.
Kanada has started to analyze the statistical distribution of the digits of pi and posted preliminary results at http://www.super-computing.org/pi-decimal_current.html.
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