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Depends on how you see it, a hole or a tube. I prefer a hole.
A common joke is that a topologist can’t see the difference between a donut and a coffee mug because you can mould a mug into a donut (assuming it has a handle).
Depends on how you see it, a hole or a tube. I prefer a hole.
A common joke is that a topologist can’t see the difference between a donut and a coffee mug because you can mould a mug into a donut (assuming it has a handle).