Maths

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   Mo. Researchers Find Largest Prime Number 
By GARANCE BURKE, Associated Press Writer 
Tue Jan 3, 10:09 PM ET 

Researchers at a Missouri university have identified the largest known prime number, officials said Tuesday. 

The team at Central Missouri State University, led by associate dean Steven Boone and mathematics professor Curtis Cooper, found it in mid-December after programming 700 computers years ago. 

A prime number is a positive number divisible by only itself and 1 � 2, 3, 5, 7 and so on. 

The number that the team found is 9.1 million digits long. It is a Mersenne prime known as M30402457 � that's 2 to the 30,402,457th power minus 1. 

Mersenne primes are a special category expressed as 2 to the "p" power minus 1, in which "p" also is a prime number. 

"We're super excited," said Boone, a chemistry professor. "We've been looking for such a number for a long time." 

The discovery is affiliated with the Great Internet Mersenne Prime Search, a global contest using volunteers who run software that searches for the largest Mersenne prime. 

 http://news.yahoo.com/s/ap/20060104/ap_on_sc/largest_prime_n umber

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Angel Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 July 2001 Status: Offline Points: 6641	Post Options Post Reply Quote Angel Report Post Thanks(0) Quote Reply Topic: Maths Posted: 22 February 2006 at 5:02pm
	Mo. Researchers Find Largest Prime Number By GARANCE BURKE, Associated Press Writer Tue Jan 3, 10:09 PM ET Researchers at a Missouri university have identified the largest known prime number, officials said Tuesday. The team at Central Missouri State University, led by associate dean Steven Boone and mathematics professor Curtis Cooper, found it in mid-December after programming 700 computers years ago. A prime number is a positive number divisible by only itself and 1 � 2, 3, 5, 7 and so on. The number that the team found is 9.1 million digits long. It is a Mersenne prime known as M30402457 � that's 2 to the 30,402,457th power minus 1. Mersenne primes are a special category expressed as 2 to the "p" power minus 1, in which "p" also is a prime number. "We're super excited," said Boone, a chemistry professor. "We've been looking for such a number for a long time." The discovery is affiliated with the Great Internet Mersenne Prime Search, a global contest using volunteers who run software that searches for the largest Mersenne prime. http://news.yahoo.com/s/ap/20060104/ap_on_sc/largest_prime_n umber
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Angel Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 July 2001 Status: Offline Points: 6641	Post Options Post Reply Quote Angel Report Post Thanks(0) Quote Reply Posted: 22 February 2006 at 5:05pm
	Prof Honored for Solving Old Math Problem Tue Dec 27, 1:34 PM ET A professor at the University of Missouri-Columbia is being recognized for solving a math problem that had stumped his peers for more than 40 years. The achievement has landed Steven Hofmann an invitation to speak next spring at the 2006 International Congress of Mathematicians in Madrid, Spain. "It is like a baseball player being picked for the all-star team," Hofmann said of the invitation to the event, which is held every four years. Hofmann became curious about the problem as an undergraduate when a professor introduced him to it. The professor was unable to solve the problem. Hofmann, 47, would have more success when the problem began to take over his life in 1996. Until he solved it in 2000, it was the last thing he thought about before he went to bed and the first thing he thought about when he woke. He spent two to eight hours each day on the problem, working periodically with several colleagues. "I could be out for a bike ride, and I would be thinking about it," Hofmann told The Kansas City Star. "Sometimes I would be doing something, get an idea and have to stop ... and write it down." The problem, known as Kato's Conjecture, applies to the theory of waves moving through different media, such as seismic waves traveling through different types of rock. It bears the name of Tosio Kato, a now-deceased mathematician at the University of California-Berkeley, who posed the problem in research papers first written in 1953 and again in 1961. Part of the problem, called the one-dimensional version, was solved about 20 years ago. Though it was a breakthrough, work remained. Hofmann solved the problem in all its dimensions in a 120-word paper that he wrote with several colleagues � Pascal Auscher, Michael Lacey, John Lewis, Alan McIntosh and Philippe Tchamitchian. "Philosophically, the reason research in math matters is that by pursuing math ideas that are deep and interesting for their own sake, you will get real-world applications in the future," Hofmann said. "It is like making investments." Theodore Slaman, chairman of the Department of Mathematics at the University of California-Berkeley, said solving a problem as old as Kato's Conjecture "is like finding the Holy Grail." "Once you have solved it, people believe you have an understanding of an entirely new area. The longer a problem has been around, the more cachet associated with solving it." ___ Information from: The Kansas City Star, http://www.kcstar.com http://news.yahoo.com/s/ap/20051227/ap_on_re_us/math_problem
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