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Mrs. Perkins's Electric Quilt by Paul J. Nahin

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Quilts & Electricity

The writer would prefer to find perfect squares by a theoretical method not demanding exhaustive computational searches, but must confess that so far he has seen no hint of such a process. Instead we have a pioneering example of the construction by computers of graphs satisfying specified nontrivial conditions.

— Mathematician William Tutte, conceding victory to computers in “solving” a mathematical problem

13.1 Recreational Mathematics

Newtonian gravity is a fascinating subject, but I’ve been discussing it for a long while now, and I (and perhaps you, as well) would enjoy a break from it. So, let’s do something completely ...

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