A theorem in limbo shows that QED is not the last word in a mathematical proof

By Julie Rehmeyer, 12:04 PM March 25, 2013

When a top-tier mathematician announced in August that he had proved one of the greatest problems in mathematics, the claim was trumpeted in the *New York Times*, *Nature*, *Science* and the* Boston Globe*.

But that didn’t make the abc conjecture proven. People often think of mathematics as a solitary pursuit, with a written proof as final product. In fact, it’s an unavoidably social activity, even for mathematicians who prefer to work alone. A theorem isn’t proven until the mathematical communi...

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