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The cost per hour of running a certain steamboat is proportional to the cube of its velocity in still water. At what speed should it be run to make a trip up stream against a four-mile current most economically?

A history of the concept of zero from as far back as the Babylonian period, with philosophical excursions into the meaning of "nothing".

NCTM Meeting in Philadelphia
This is the title page of the 1640 printing of Galileo's Operation of the Geometrical and Military Compass, originally published privately in 1606. Galileo had invented a version of this geometrical compass a few years earlier and evidently gave copies of this manual to those who bought the compass. The compass had many uses, from performing square root calculations to determining ranges of cannons to solving surveying problems.
A castle has n rooms each of which has 7 samurai in it.
A certain merchant increases the value of his estate by 1/3...
A historically minded textbook designed to teach real analysis by considering some of the problems faced by 19th century mathematicians.
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.
This a wonderfully written tour of aspects of classical geometry-- a must read for all geometry teachers.