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Convergence articles

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Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
Now there are three sisters who leave home together.
A ladder has 100 steps. On the first step sits 1 pigeon; on the second, 2; on the third, 3; and so on up to the hundredth. How many pigeons in all?
A certain merchant increases the value of his estate by 1/3...
A set of n disjoint, congruent circles packs the surface of a sphere S so that each region of the surface exterior to the circles is bounded by arcs of three of the circles.

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.

A history of the various algebraic structures that came together to give us "abstract algebra" by early in the twentieth century.
In a given square, inscribe 4 equal circles so that...
There is a log 18 feet long, the diameter of the extremities being 1 ft and 2.6 ft respectively...
Find the isoceles triangle of smallest area that circumscribes a circle of radius 1.