Including the hole at the center of the CD? | Hacker News

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		dist-epoch 3 months ago \| parent \| context \| favorite \| on: What is a manifold? Including the hole at the center of the CD?

ChrisGreenHeur 87 days ago [–]

there can be no hole on the cd shaped object, technically disc is the word to use but the point of the sentence is to provide a vivid picture

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