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Convergence articles

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The number 50 is divided by a certain number. If the divisor is increased by 3, the quotient decreases by 3.75. What is the number?
Reprint of a classic biography of Gauss, with a new forward by Jeremy Gray.
A two door gate of unknown width is opened so that a 2 inch gap exists between the two doors.
A description of a Research Experience for Undergraduates conducted in 2007 at Hood College.
Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
A history of attempts to solve cubic and higher degree polynomial equations, including the notions of group theory and their relationship to the idea of symmetry.
A gentleman has a garden of rectangular form and wants to construct a walk of equal width half way round to take up half the garden. What must be the width of this walk?
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 website with links to information about numerous topics in the history of mathematics.