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Recycling Topology

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Author:Ivars Peterson (MathLand)
Description: It's hard to miss the triangle of three bent arrows that signifies recycling. It appears in newspapers and magazines and on bottles, envelopes, cardboard cartons, and other containers. But have you noticed that there are two versions of this ubiquitous symbol? The difference between them lies in the direction of the twist in two of the arrows that make up each figure. Cliff Long, a math professor at Bowling Green State University, has an eye for such details.

Levels: Middle School (6-8), High School (9-12), College
Languages: English
Resource Types: Graphics, Articles
Math Topics: Topology

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