Team Cracks CenturyOld Math Puzzle

Wednesday, March 21, 2007; 7:49 AM
PALO ALTO, Calif.  An international team of mathematicians says it has cracked a 120yearold puzzle that researchers say is so complicated that its handwritten solution would cover the island of Manhattan.
The 18member group of mathematicians and computer scientists was convened by the American Institute of Mathematics in Palo Alto to map a theoretical object known as the "Lie group E8."
Lie (pronounced Lee) groups were invented by 19thcentury Norwegian mathematician Sophus Lie in his study of symmetrical objects, especially spheres, and differential calculus.
The E8 group, which dates to 1887, is the most complicated Lie group, with 248 dimensions, and was long considered impossible to solve.
"To say what precisely it is is something even many mathematicians can't understand," said Jeffrey Adams, the project's leader and a math professor at the University of Maryland.
The problem's proof, announced Monday at the Massachusetts Institute of Technology, took the researchers four years to find. It involves about 60 times as much data as the Human Genome Project.
When stored in highly compressed form on a computer hard drive, the solution takes up as much space as 45 days of continuous music in MP3 format.
"It's like a Mount Everest of mathematical structures they've climbed now," said Brian Conrey, director of the institute.
The calculation does not have any obvious practical applications but could help advance theoretical physics and geometry, researchers said.