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Convergence articles

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A biography of the geometer Donald Coxeter.
You have two sums of money, the difference of which is 2 dirhams; you divide the smaller sum by the larger and the quotient is equal to 1/2. What are the two sums of money?
A new edition of a classic work on number theory.
Information on previous ESUs
A study and English translation of Servois' attempt to place calculus on a foundation of algebraic analysis without recourse to infinitesimals, continuing the work of Lagrange.
A collection of original texts to help students learn some important areas of mathematics.
A survey of the mathematics education of cadets in the first century after the founding of the U.S. Military Academy.
Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
In a circle whose circumference is 60 units, a chord is drawn forming a segment whose sagitta is 2 units. What is the length of the chord?
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?