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One person possesses 7 asava horses, another 9 haya horses, and another 9 camels. Each gives two animals away, one to each of the others.

Mathematical Treasure: Robert Tanner's A Mirror for Mathematiques

Images from a 16th-century text about the astrolabe and its uses

Surveying a Field

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.

Napier's e

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

Deer in the City

Now there are 100 deer [being distributed] in a city. If one household has one deer there is a remainder...Find the number of households in the city.

Pair of Numbers

There are two numbers whose sum equals the difference of their squares.

But What's in the Flasks?

Thirty flasks—10 full, 10 half-empty, and 10 completely empty—are to be divided among 3 sons so that flasks and contents should be shared equally. How may this be done?

A Radical Approach to Real Analysis

A historically minded textbook designed to teach real analysis by considering some of the problems faced by 19th century mathematicians.

Ladder Day Question

A ladder is placed perpendicular to the plane of the horizon, and in coincidence with the plane of an upright wall.