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David Richeson: Division by Zero
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Everyday geometry: hat size – David Richeson: Division by Zero
https://divisbyzero.com/2010/04/12/everyday-geometry-hat-size/
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I don’t wear hats very often. Occasionally I wear a baseball hat. Twice a year I wear the hat that accompanies my academic regalia. If you need to buy a hat, the first thing you need to know …
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