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Convergence articles

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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.
Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
This conference takes place in 2006 at Pennsylvania State University, Erie.
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?

How a translation of Peano's counterexample to the 'theorem' that a zero Wronskian implies linear dependence can help your differential equations students

Title page from the Ars Magna, by Gerolamo Cardano, published in 1545. Engraved portrait of the author. First printed text of algebraic solution of cubic equations.
Given four numbers whose sum is 9900; the second exceeds the first by 1/7 of the first...

A comparison of the Greek and Chinese approach to the idea of similarity.

Now a good horse and an inferior horse set out from Chang'an to Qi. Qi is 3000 li from Chang'an.
In a given square, inscribe 4 equal circles so that...