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The author became fascinated with the mysterious role of √-1 in electronics. Turning to history for insight, he brings the perspectives of both a practical man and a scholar in conveying the enchantment of mathematics for a non-mathematician.
Two excellent volumes on Euler in honor of his three hundredth birthday
A person has a circular yard that is 150 ft. in diameter, and wishes a walk of equal width made round it within the fence...

Three images from Kepler's 1609 Astronomia Nova, the text in which he introduced his first two laws of planetary motion

The third part of a necklace of pearls, broken in a lover's quarrel, fell to the ground...
The "rood", a linear measure dating from many centuries ago, is calculated anew in today's classrooms.
Determine the dimensions of the least isosceles triangle ACD that can circumscribe a given circle.
A speculator bought stock at 25% below par and sold it at 20% above par. He gained $1560. How much did he invest?
Problems taken from Chinese sources
What will the diameter of a sphere be, when its volume and surface area are expressed by the same number?

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