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Convergence articles

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Curve sketching, tangent lines, and optimization, explored via interactive applets

A description of this well-regarded website.
The Fundamental Theorem of Calculus is presented in the version of Scottish mathematician James Gregory -- without the use of limits.

Having been given the lengths, a and b, of two straight lines drawn from the acute angles of a right triangle to the middle of the opposite sides, determine the lengths of those sides.

Paul Halmos Photograph Collection, page 3: M. Auslander, R. Baer, Banchoff, C. N. Moore, I. A. Barnett, P. Erdos, and Lida Barrett
A small selection of Euler's works, explained by a master expositor.
Explain the geometric basis of "completing the square," the original method of solving quadratic equations, to your students.
This is the title page of the French edition of Leonhard Euler's text on Algebra. The text was originally published in German in 1767 in St. Petersburg and then translated into French in 1795.
A collection of articles on mathematics in Europe from the twelfth to the fifteenth century.
In many sources, we see that Tartaglia has the surname Fontana. According to the author of this article, the co-discoverer of the cubic formula did not ever use that name.