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Mathematicians have studied knots for centuries, but a new material is showing why some knots are better than others.
No one knows how to find the smallest shape that can cover all other shapes of a certain width. But high school geometry is getting us closer to an answer.
New work on the problem of “scissors congruence” explains when it’s possible to slice up one shape and reassemble it as another.
Two monumental works have led many mathematicians to avoid the equal sign. The process has not always gone smoothly.