Concept explainers
Twisted up (H). Suppose you are given a band of paper with a lot of twists in it. How can you tell without counting whether you have an even number of half twists or an odd number? Can you deduce a general fact about what you would have if there are an odd number of half twists and what you would have if there are an even number of half twists? Try. (Hint: Experiment by drawing on various physical models.)
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EBK THE HEART OF MATHEMATICS: AN INVITA
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