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This is page 167 from the Exercitationes mathematicae (1657) of Frans van Schooten (1615-1660). This book contained a collection of mathematical construction problems, among much else. It was one of the books read by Isaac Newton while he was a student at Cambridge University and helped to introduce him to modern mathematics. On this page we see a construction enabling one to find the distance across a river.
The history of the four color problem with sketches of the attempted proofs in the nineteenth century and an outline of the computer proof of the twentieth century.
A collection of short pieces detailing how Euler solved a particular mathematics problem.
Tartaglia's method for solving cubics, which he eventually explained to Cardano.
A certain merchant increases the value of his estate by 1/3...
A set of n disjoint, congruent circles packs the surface of a sphere S so that each region of the surface exterior to the circles is bounded by arcs of three of the circles.

A bibliographical reference to mathematics books printed in the new world before 1700.

A collection of biographies of sixty mathematicians from the eighteenth century to the twentieth.
Four episodes in the history of geometry are discussed, where dynamic geometry helps in understanding the ideas.