Hooked on Mathematics

Some people crochet sweaters and scarves. Hinke M. Osinga decided to use a hooked needle and yarn to create something a little less homey: a three-foot-tall model of a chaotic mathematical system.

Ms. Osinga, the daughter of a handicrafts teacher and a math teacher, used the project to combine a lifelong hobby with her career as a tenured lecturer in mathematics at the University of Bristol. The result was a geometric model of the "Lorenz manifold," which describes certain aspects of

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