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The Tree of Proportions and Proportionality from the De Divina Proportione of Luca Pacioli published in 1509.
The Fundamental Theorem of Calculus is presented in the version of Scottish mathematician James Gregory -- without the use of limits.

A book delving into the working of the mathematical mind.

A small selection of Euler's works, explained by a master expositor.

The annual meeting of the NCTM always contains sessions dealing with the history of mathematics and its use in teaching.

The story of Gerbert, who became Pope Sylvester II in 999, and his mathematics.

Page 8, Images from the Paul Halmos Photograph Collection: Armand Borel, Karol Borsuk, Raoul Bott, William Browder, H. Arlen Brown, and R. Creighton Buck

A new history of mathematics text which asks lots of questions about the history and the mathematics.

This is the title page of the Treatise of Algebra (1685), by John Wallis. This is probably the first attempt at a history of the subject of algebra, presented in the context of a text on the subject. Among the most famous parts of this treatise is Wallis's discussion of the work of Thomas Harriot, especially his contention that Rene Descartes plagiarized Harriot's symbolization procedure in algebra.

If an arc of 45 degrees on one circumference is equal to an arc of 60 degrees on another circle, what is the ratio of the areas of the circles?