When you fold, cut, and twist paper into knots, it follows rules that mathematicians are just beginning to discover.
Figure 5-1. A hexaflexagon.
Math isn’t just about times tables and word problems. One of the things mathematicians do is to find formulas to describe the world around them. And over the years, paper has been a convenient material for investigating and explaining different ideas in math. Even today, when computers can perform calculations millions of times faster than the human brain and create an image of almost anything, mathematicians still use paper models to help them see, touch, and understand the ...
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