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Convergence articles

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There is a number which when divided by 2, or 3, or 4, or 5, or 6 always has a remainder of 1 and is truly divisible by 7. It is sought what is the number?
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 discussion of aspects of Leonardo of Pisa's Book of Squares.
A lady has two silver cups, and only one cover for both. The first cup weighs 16 oz, and when it is covered it weighs 3 times as much as the second cup; but when the second cup is covered, it weighs 4 times as much as the first.
A collection of articles on using the history of mathematics of the past 200 years in the undergraduate classroom.
Greek ladders for approximating square roots may be more ancient than the ancient Greeks. Students at any level can appreciate their beauty and simplicity. Those who have studied calculus can compare them with Newton's Method for approximating roots.
In a given square, inscribe 4 equal circles so that...
The work of ten scientists who thought deeply about patterns.
Find the isoceles triangle of smallest area that circumscribes a circle of radius 1.
A portrait gallery of mathematicians, mostly taken from the collection at the Dibner Library of the Smithsonian, with permission.