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Hyperbolic
Slot displays an aspect of mathematics which is positively
arresting. A flat vertical plane made of plastic is
mounted on a table top; there is a curve cut into the
plastic sheet. Next to the plastic sheet stands a straight
stick which is mounted on a vertical rod. The stick,
even though it is straight, swings cleanly through the
radically curved slot in the plastic. Graphics explain
why this is so, and describe the nature of the curve.
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