Find the greatest value of y in the equation a4 x2= (x2 + y2)3.

Individual problems from throughout mathematics history, as well as articles that include problem sets for students.

Find the greatest value of y in the equation a4 x2= (x2 + y2)3.

A square walled city measures 10 li on each side. At the center of each side is a gate. Two persons start walking from the center of the city.

Prove that if the sums of the square opposite sides of any quadrilateral are equal, its diagonals interect at right angles.

The authors recount the 'great tale' of Napier's and Burgi's parallel development of logarithms and urge you to use it in class.

A powerful, unvanquished, excellent black snake, 80 angulas in length, enters into a hole at the rate of 7 1/2 angulas in 5/14 of a day, and in the course of a day its tail grows 11/4 of an angula.

A lady being asked how old she was at the time of her marriage replied that the age of her oldest son was 13; that he was born 2 years after her marriage...

A series of circles have their centers on an equilateral hyperbola and pass through its center. Show that their envelope is a lemniscate.

How a translation of Peano's counterexample to the 'theorem' that a zero Wronskian implies linear dependence can help your differential equations students

Given a wooden log of diameter 2 feet 5 inches from which a 7 inch thick board is to be cut, what is the maximum possible width of the board?

There is a log 18 feet long, the diameter of the extremities being 1 ft and 2.6 ft respectively...