A Russian awarded $1million (£666,000) for solving one of the most intractable problems in mathematics said yesterday that he does not want the money.
Said to be the world's cleverest man, Dr Grigory Perelman, 44, lives as a recluse in a bare cockroach-infested flat in St Petersburg. He said through the closed door: 'I have all I want.'
The prize was given by the U.S. Clay Mathematics Institute for solving the Poincare Conjecture, which baffled mathematicians for a century. Dr Perelman posted his solution on the internet.
He failed to turn up to receive his prestigious Fields Medal from the International Mathematical Union in Madrid four years ago.
At the time he stated: 'I'm not interested in money or fame. I don't want to be on display like an animal in a zoo.
'I'm not a hero of mathematics. I'm not even that successful, that is why I don't want to have everybody looking at me.'
Neighbour Vera Petrovna said: 'I was once in his flat and I was astounded. He only has a table, a stool and a bed with a dirty mattress which was left by previous owners - alcoholics who sold the flat to him.
'We are trying to get rid of cockroaches in our block, but they hide in his flat.'
It was in 2003 that Perelman, then a researcher at the Steklov Institute of Mathematics in St. Petersburg, began posting papers online suggesting he had solved the Poincare Conjecture, one of seven major mathematical puzzles for which the Clay Institute is offering $1 million each.
Rigorous tests proved he was correct.
The topological conundrum essentially states that any three-dimensional space without holes in it is equivalent to a stretched sphere.
The puzzle was more than 100 years old when Perelman solved it - and can help determine the shape of the universe.
After 2003 Perelman gave up his job at the Steklov Institute. Friends have been reported as saying he has resigned.
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