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Convergence articles

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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.
Now there are three sisters who leave home together.
Wanting to know the breadth of a river, I measured a base of 500 yards in a straight line close by one side of it.
In baking a hemispherical loaf of bread of 10" radius, the crust was everywhere of an equal thickness, and the solidity of the crust was equal to half the solid content of the whole loaf. What were the dimensions of the interior soft part?

The author shows how teachers can use Leonhard Euler's original works in the classroom to explore Euler's famous polyhedral formula,
V + F = E + 2.

The "rood", a linear measure dating from many centuries ago, is calculated anew in today's classrooms.

A history of the various algebraic structures that came together to give us "abstract algebra" by early in the twentieth century.
Problems taken from Chinese sources
There is a log 18 feet long, the diameter of the extremities being 1 ft and 2.6 ft respectively...
A four-sided town measures 1100 feet on one side and 1000 feet on the other side, on one edge 600 and the other edge 600.

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