Russian-born brainiac cracks 'insoluble' puzzle

Published: 09 February, 2008, 07:27

A Russian-born scientist has solved a maths problem that had had experts scratching their heads for almost four decades. Using just a pencil and paper, Avraham Trahktman, who immigrated to Israel in 1990, cracked what is known as the Road Colouring proble

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