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This is a page from a manuscript of the Algebra (Maqalah fi al-jabra wa-al muqabalah) of Omar Khayyam (1048-1131). This work is known for its solution of the various cases of the cubic equation by finding the intersections of appropriately chosen conic sections.
What will the diameter of a sphere be, when its volume and surface area are expressed by the same number?
We sadly announce the untimely death of one of Convergence's editorial board members.
Request from the editors.
Prove that if the sums of the square opposite sides of any quadrilateral are equal, its diagonals interect at right angles.
A man died leaving 3 sons, to whom he bequeathed his estate in the following manner: to the eldest he gave 184 dollars; to the second 155 dollars and to the third 96 dollars;
This 1989 revision of the 1969 NCTM yearbook still provides wonderful suggestions for using the history of mathematics in the classroom.
Mesopotamian accounting evolved from simple clay token counters to a number-recording system that included impressions of these tokens on clay tablets.
A collection of illustrations of Inca quipus, with references to their earliest descriptions.
A popular history of ancient mathematics, dealing with the mathematics of ancient Egypt and Babylonia.

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