Honoring Perelman for Resolving a Century-Old Mathematical Problem

The Clay Mathematics Institute in Cambridge, Massachusetts, last week honoured Perelman for his solution to a problem posed almost a century ago by French mathematician Henri Poincaré. The theorem – known as Poincaré's conjecture – involves the deep structure of three-dimensional shapes. It is one of seven elusive challenges set by the institute, each carrying a $1m reward. It took the world's leading mathematicians several years to verify that Perelman had definitively solved the problem in a paper published in 2002