One of the rules of mathematics and physics, as I - a complete non-mathematician - read often in science books, is that when infinity is introduced into a scientific equation it no longer makes sense.

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As a non-mathematician, he appreciates the difficulty of explaining a recondite mathematical problem to a general audience, and gives a vivid account both of the passion that mathematicians have for their subject and of the fascination for this particular problem.

ECONOMIST: Mathematics

But now mathematician Max Little has come up with a non-invasive, cheap test which he hopes will offer a quick new way to identify the disease.

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