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      Millennium Problems

      comics.movim.eu / XKCD · Monday, 15 June, 2020 - 04:00

    The hard part about opening a hole in the proof of the Poincaré conjecture is that Grigori Perelman will come out of retirement to try to fix it by drawing a loop around the hole and contracting it to a point.
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      xkcd.com /2320/