Imagine a coffee mug and a cinnamon donut on the table before you. They appear as completely different objects -- but to a mathematician, the mug and the donut are topologically equivalent, ...
Michael Freedman’s momentous 1981 proof of the four-dimensional Poincaré conjecture was on the verge of being lost. The editors of a new book are trying to save it. One of the most important pieces of ...
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