A claim to have solved one of the most difficult riddles in mathematics has been challenged by scientists. Vinay Deolalikar, a mathematician based at Hewlett-Packard laboratories in California, US, claims to have solved the problem of P vs NP. This has been described as the biggest problem in computer science; it is one of seven Millennium Prize Problems set out by the Clay Mathematics Institute. But maths experts have weighed in to point out flaws in his proof.
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