• kryptonianCodeMonkey@lemmy.world
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      4 days ago

      No, they’re right. Normally the interior of the much isn’t a topological hole as it only has the one “exit”. But when you connect the surfaces for the center hole, it creates a third hole in the interior of the mug.

      • valar@lemmy.ca
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        4 days ago

        Shit, you’re right. I was thinking of a normal mug. So “adding the donut hole” actually created two holes.