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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.
The purchase price for an apple and an orange is 100 yen. When n oranges and n + 3 apples are bought the price is 520 yen. Find the number n of oranges and the price of one orange.
There is a circle from within which a square is cut, the remaining portion having an area of 47.6255 square units.
The Fundamental Theorem of Calculus is presented in the version of Scottish mathematician James Gregory -- without the use of limits.
One person possesses 7 asavas horses, another 9 hayas horses, and another 9 camels. Each gives two animals away, one to each of the others.

Images of the first printed edition of Euclid's Elements

A small selection of Euler's works, explained by a master expositor.
I was employed to survey a field, which I was told was an exact geometrical square, but by reason of a river running through it, I can only obtain partial measurements.

A discussion of why we use "e" to represent the base of the natural logarithm system.

Suppose the area of an equilateral triangle be 600. The sides are required.